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U.S. President Barack Obama meets with Russian Prime Minister Vladimir Putin in Moscow on Tuesday. ((Jim Young/Reuters))

A recent U.S.-Russia summit was "groundbreaking" for relations between the former Cold War adversaries, a senior Russian diplomat said Thursday.

The two sides "have managed to stop the degradation of our relations," Russian Foreign Ministry representative Andrei Nesterenko said in comments televised in Moscow.

U.S. President Barack Obama met with Russian President Dmitry Medvedev in Moscow on Monday and Tuesday.

They signed several  agreements including on military co-operation and arms reduction.

Relations between the two countries had been tense in recent years because of disagreements including the expansion of NATO and U.S. plans for a missile defence system in Central Europe.

With files from The Associated Press