I want to know the answer to the following question:
Which nation formed the nucleus of the Warsaw Pact?
All the background I'm provided with is that "The Warsaw Pact (formally, the Treaty of Friendship, Co-operation, and Mutual Assistance, sometimes, informally WarPac, akin in format to NATO) was a collective defense treaty among Soviet Union and seven Soviet satellite states in Central and Eastern Europe in existence during the Cold War.". Is that enough to answer the question?
Answer: yes