Which formerly hostile Western European state recognised the Soviet regime in 1924?

Litvinov, the Soviet Foreign Commissar until May 1939, signed non-aggression pacts with a number of states in 1928, in a bid to enhance Soviet security. With which of the following countries did he not sign such an agreement?

In 1934 Litvinov secured Soviet membership of an international organisation, which he felt could confer on the USSR the benefits of collective security. What was this organisation?

In May 1939 Litvinov was dismissed, and a new Foreign Commissar, who was more in favour of doing a deal with Hitler, was appointed. Who was this?

On the 23rd of August 1939 the German Foreign Minister flew to Moscow to sign a treaty with Stalin. What was this treaty called?

On the 17th of September 1939, in accordance with the terms of the recent agreement with Germany, Soviet forces invaded a neighbouring state, and began to enforce a brutal version of communism there. Which state was this?

At the end of 1939, and well into 1940, the Red Army was engaged in a bruising war with Finland. What name is this conflict sometimes given?

In 1940 - again in accordance with the August 1939 treaty - Stalin invaded three neighbouring states, whose independence Lenin had been content to respect. Which of the three had never enjoyed the protection of the "Litvinov Protocol" from 1928?

What name was given to the German assault on the Soviet Union in June 1941?

Which Western European leader (formerly a strong opponent of Stalin and Soviet communism) said at the time of the German attack on Russia in June 1941: "If Hitler invaded hell, I would make favourable representations to the devil".