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Last week, the U.S. Senate gave its advice and consent to the New Strategic Arms Reduction Treaty (New START), which had been signed in April. The Russian legislature still has to provide final approval of the treaty, but it is likely to do so, and therefore a New START is set to go into force. That leaves two questions to discuss. First, what exactly have the two sides agreed to and, second, what does it mean? Let's begin with the first.

The original START was signed July 31, 1991, and reductions were completed in 2001. The treaty put a cap on the number of nuclear warheads that could be deployed. In addition to limiting the number of land- and submarine-based intercontinental ballistic missiles (ICBMs) and strategic bombers, it capped the number of warheads that were available to launch at 6,000. The fact that this is a staggering number of nuclear weapons should give you some idea of the staggering number in existence prior to START. START I lapsed in 2009, and the new treaty is essentially designed to reinstate it.

It is important to remember that Ronald Reagan first proposed START. His initial proposal focused on reducing the number of ICBMs. Given that the Soviets did not have an effective intercontinental bomber force and the United States had a massive B-52 force and follow-on bombers in the works, the treaty he proposed would have decreased the Soviet quantitative advantage in missile-based systems without meaningfully reducing the U.S. advantage in bombers. The Soviets, of course, objected, and a more balanced treaty emerged.

What is striking is that START was signed just before the Soviet Union collapsed and implemented long after it was gone. It derived from the political realities that existed during the early 1980s. One of the things the signers of both the original START and the New START have ignored is that nuclear weapons by themselves are not the issue. The issue is the geopolitical relationship between the two powers. The number of weapons may affect budgetary considerations and theoretical targeting metrics, but the danger of nuclear war does not derive from the number of weapons but from the political relationship between nations.

The Importance of the Political Relationship

I like to use this example. There are two countries that are historical enemies. They have fought wars for centuries, and in many ways, they still don't like each other. Both are today, as they have been for decades, significant nuclear powers. Yet neither side maintains detection systems to protect against the other, and neither has made plans for nuclear war with the other. This example is from the real world; I am speaking of Britain and France. There are no treaties between them regulating nuclear weapons in spite of the fact that each has enough to devastate the other. This is because the possession of nuclear weapons is not the issue. The political relationship between Britain and France is the issue and, therefore, the careful calibration of the Franco-British nuclear balance is irrelevant and unnecessary.

The political relationship that existed between the United States and the Soviet Union in the 1980s is not the same as the relationship that exists today. Starting in the 1950s, the United States and Soviet Union were in a state of near-war. The differences between them were geopolitically profound. The United States was afraid that the Soviets would seize Western Europe in an attack in order to change the global balance of power. Given that the balance of power ran against the Soviet Union, it was seen as possible that they would try to rectify it by war.

Since the United States had guaranteed Europe's security with troops and the promise that it would use nuclear weapons against the Soviet Union to block the conquest of Europe, it followed that the Soviet Union would initiate war by attempting to neutralize the American nuclear capability. This would require a surprise attack on the United States with Soviet missiles. It also followed that the United States, in order to protect Europe, might launch a pre-emptive strike against the Soviet military capability in order to protect the United States and the balance of power.

Until the 1960s, the United States had an overwhelming advantage. Its bomber force gave it the ability to strike the Soviet Union from the United States. The Soviets chose not to build a significant bomber force, relying instead on a missile capability that really wasn't in place and reliable until the mid-1960s. The Cuban missile crisis derived in part from this imbalance. The Soviets wanted Cuba because they could place shorter-range missiles there, threatening the B-52 fleet by reducing warning time and threatening the American population should the B-52s strike the Soviet Union.

A complex game emerged after Cuba. Both sides created reliable missiles that could reach the other side, and both turned to a pure counter-force strategy, designed to destroy not cities but enemy missiles. The missiles were dispersed and placed in hardened silos. Nuclear submarines, less accurate but holding cities hostage, were deployed. Accuracy increased. From the mid-1960s on the nuclear balance was seen as the foundation of the global balance of power.

The threat to global peace was that one side or the other would gain a decisive advantage in the global balance. Knowledge of the imbalance on both sides would enable the side with the advantage to impose its political will on the other, which would be forced to capitulate in any showdown.

The Russo-American Strategic Balance

Therefore, both sides were obsessed with preventing the other side from gaining a nuclear advantage. This created the nuclear arms race. The desire to end the race was not based on the fear that more nuclear weapons were dangerous but on the fear that any disequilibrium in weapons, or the perception of disequilibrium, might trigger a war. Rather than a dynamic equilibrium, with both sides matching or overmatching the other's perceived capability, the concept of a treaty-based solution emerged, in which the equilibrium became static. This concept itself was dangerous because it depended on verification of compliance with treaties and led to the development of space-based reconnaissance systems.

The treaties did not eliminate anxiety. Both sides continued to obsessively watch for a surprise attack, and both sides conducted angry internal debates about whether the other side was violating the treaties. Similarly, the deployment of new systems not covered by the treaties created internal political struggles, particularly in the West. When the Pershing II medium-range ballistic missiles were deployed in Europe in the 1980s, major resistance to their deployment from the European left emerged. The fear was that the new systems would destabilize the nuclear balance, giving the United States an advantage that might lead to nuclear war.

This was also the foundation for the Soviets' objection to the Reagan administration's Strategic Defense Initiative, dubbed "Star Wars." Although Star Wars seemed useful and harmless, the Soviets argued that if the United States were able to defend itself against Soviet attack, then this would give the United States an advantage in the nuclear balance, allowing it to strike at the Soviet Union and giving it massive political leverage. This has always been the official basis of the Russian objection to ballistic-missile defense (BMD) - they said it upset the nuclear balance.

The United States never wanted to include tactical nuclear weapons in these treaties. The Soviet conventional force appeared substantially greater than the American alliance's, and tactical nuclear weapons seemed the only way to defeat a Soviet force. The Soviets, for their part, would never agree to a treaty limiting conventional forces. That was their great advantage, and if they agreed to parity there it would permanently remove the one lever they had. There was no agreement on this until just before the Soviet Union collapsed, and then it no longer mattered. Thus, while both powers wanted strategic stability, the struggle continued on the tactical level. Treaties could not contain the political tension between the United States and the Soviet Union.

And now we get to the fundamental problem with the idea of a nuclear balance. The threat of nuclear war derived not from some bloodthirsty desire to annihilate humanity but from a profound geopolitical competition by the two great powers following the collapse of European power. The United States had contained the Soviet Union, and the Soviet Union was desperately searching for a way out of its encirclement, whether by subversion or war. The Soviet Union had a much more substantial conventional military force than the United States. The Americans compensated with nuclear weapons to block Soviet moves. As the Soviets increased their strategic nuclear capability, the American limit on their conventional forces decreased, compensated for by sub-strategic nuclear forces.

But it was all about the geopolitical situation. With the fall of the Soviet Union, the Soviets lost the Cold War. Military conquest was neither an option nor a requirement. Therefore, the U.S.-Soviet nuclear balance became meaningless. If the Russians attacked Georgia the United States wasn't about to launch a nuclear war. The Caucasus is not Western Europe. START was not about reducing nuclear forces alone. It was about reducing them in a carefully calibrated manner so that no side gained a strategic and therefore political advantage.

New START is therefore as archaic as the Treaty of Versailles. It neither increases nor decreases security. It addresses a security issue that last had meaning more than 20 years ago in a different geopolitical universe. If a case can be made for reducing nuclear weapons, it must be made in the current geopolitical situation. Arguing for strategic arms reduction may have merit, but trying to express it in the context of an archaic treaty makes little sense.

New START's Relevance

So why has this emerged? It is not because anyone is trying to calibrate the American and Russian nuclear arsenals. Rather, it goes back to the fiasco over the famous "reset button" that Hillary Clinton brought to Moscow last March. Tensions over substantial but sub-nuclear issues had damaged U.S.-Russian relations. The Russians saw the Americans as wanting to create a new containment alliance around the Russian Federation. The Americans saw the Russians as trying to create a sphere of influence that would be the foundation of a new Moscow-based regional system. Each side had a reasonable sense of the other's intentions. Clinton wanted to reset relations. The Russians didn't. They did not see the past as the model they wanted, and they saw the American vision of a reset as a threat. The situation grew worse, not better.

An idea emerged in Washington that there needed to be confidence-building measures. One way to build confidence, so the diplomats sometimes think, is to achieve small successes and build on them. The New START was seen as such a small success, taking a non-objectionable treaty of little relevance and effectively renewing it. From here, other successes would follow. No one really thought that this treaty mattered in its own right. But some thought that building confidence right now sent the wrong signal to Moscow.

U.S. opposition was divided into two groups. One, particularly Republicans, saw this as a political opportunity to embarrass the president. Another argued, not particularly coherently, that using an archaic issue as a foundation for building a relationship with Russia allowed both sides to evade the serious issues dividing the two sides: the role of Russia in the former Soviet Union, NATO and EU expansion, Russia's use of energy to dominate European neighbors, the future of BMD against Iran, Russia's role in the Middle East and so on.

Rather than building confidence between the two countries, a New START would give the illusion of success while leaving fundamental issues to fester. The counter-argument was that with this success others would follow. The counter to that was that by spending energy on a New START, the United States delayed and ignored more fundamental issues. The debate is worth having, and both sides have a case, but the idea that START in itself mattered is not part of that debate.

In the end, the issue boiled down to this. START was marginal at best. But if President Barack Obama couldn't deliver on START his credibility with the Russians would collapse. It wasn't so much that a New START would build confidence as it was that a failure to pass a New START would destroy confidence. It was on that basis that the U.S. Senate approved the treaty. Its opponents argued that it left out discussions of BMD and tactical nuclear weapons. Their more powerful argument was that the United States just negotiated a slightly modified version of a treaty that Ronald Reagan proposed a quarter century ago and it had nothing to do with contemporary geopolitical reality.

Passage allowed Obama to dodge a bullet, but it leaves open a question that he does not want to answer: What is American strategy toward Russia? He has mimicked American strategy from a quarter century ago, not defined what it will be.