The russians halted their offensive near warsaw and let the germans massacre the home army, while

The Soviet Union not only refused to condemn the German action but also launched its own invasion against Poland 16 days after the Nazi attack. Similarly, Germany was silent about the attack launched against Finland by the Soviet Union, during the so-called Winter War, in December 1939. Under this pact in June 1940 the Soviet Union also annexed Estonia, Lithuania and Latvia , immediately after the German triumph in the battle of France, and simultaneously annexed territories of the Kingdom of Romania.

Explanation:

the right answer for the question that is being asked and shown above is that: "their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.  " the  participant in european imperialism is being described below is that  their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.