An invasion of this country occurred one week after two other countries agreed to the (*) Molotov-Ribbentrop Pact.
This nation saw a massacre of its citizens at Volhynia. After the rule of Edward Gierek, an agreement in this country led to the formation of an independent trade union led by a former electrician. That trade union in this country was formed in Gdansk and called Solidarity. An invasion of this country occurred one week after two other countries agreed to the (*) Molotov-Ribbentrop Pact. For 10 points, name this nation whose 1939 invasion marked the start of World War II when it was attacked on both fronts by Germany and Russia.
This nation saw a massacre of its citizens at Volhynia. After the rule of Edward Gierek, an agreement in this country led to the formation of an independent trade union led by a former electrician.
Republic of {Poland} [or Rzeczpospolita {Polska}]