 In the 1980s, the P-3s were occasionally augmented by carrier-based S-3 Vikings operating ashore, as well as Canadian Forces' Lockheed CP-140 Aurora and Royal Air Force Hawker Siddeley Nimrod MR.2 aircraft.By the early 1990s, the range of submarine-launched ballistic missiles (SLBM) had so increased that Soviet submarines no longer found it necessary to come within range of Bermuda-based patrol aircraft in order to strike their targets in the United States.This was followed by the dissolution of the Soviet Union in 1991 and a general lessening of tensions between the now renamed Russian Federation and the US.