Modern day name of countries that were part of the Warsaw Pact, formally the Treaty of Friendship, Cooperation and Mutual Assistance, that was a collective defence treaty signed in May 1955, during the Cold War.
The Warsaw Pact member was the USSR, not Russia alone (which was only one of fifteen Soviet Republics, albeit the largest by far by both landmass and population).
Estonia, Latvia, Lithuania, Georgia, Ukraine, Belarus, Moldova, Kyrgyzstan, Kazakhstan, Uzbekistan, Turkmenistan, Tajikistan, Armenia and Azerbaijan were all part of the USSR and therefore the Warsaw Pact.
Estonia, Latvia, Lithuania, Georgia, Ukraine, Belarus, Moldova, Kyrgyzstan, Kazakhstan, Uzbekistan, Turkmenistan, Tajikistan, Armenia and Azerbaijan were all part of the USSR and therefore the Warsaw Pact.