Russian President Vladimir Putin and U.S. President Barack Obama have discussed the situation in Ukraine in a telephone conversation.

"Relevant aspects of the bilateral and international agenda, including the situation in Ukraine, were discussed substantively. The president of Russia mentioned the necessity of taking urgent measures to stabilize the situation, emphasizing the importance of working with the radical opposition that has led the confrontation in Ukraine to an extremely dangerous threshold," the Kremlin press service said in a statement.

Putin and Obama also "mentioned a constructive nature of bilateral interaction on the Iranian nuclear program. They agreed to continue intensive cooperation on this subject.

The presidents of Russia and the U.S. exchanged opinions on the implementation of agreements on destroying the Syrian chemical weapons. Bearing in mind the negotiations in Geneva, the two countries' foreign policy chiefs will continue to cooperate closely to promote a settlement in Syria," the statement says.

Obama also congratulated Putin on the successful organization of the 2014 Olympic Winter Games in Sochi, it says.

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