By Li Hongmei

Russia will agree to discuss possible solutions to the Ukrainian crisis with its international partners if the February 21 agreement, signed by Viktor Yanukovych and opposition leaders, is implemented and if a wide range of the country's political forces become engaged in this process, a Russian Foreign Ministry source told reporters.

"Russia will discuss the situation around Ukraine and ways out of the crisis with its international partners," he said.

"However, there are two requirements that are fundamentally important to us: the implementation of the February 21 agreement, which paves the way for constitutional reform and the establishment of a coalition government, as well as the wide representation of Ukraine's political forces in this process," he added.

Meanwhile, US President Barack Obama met for over two hours on Monday with his national security advisers and discussed ways the United States and its allies could "further isolate" Russia over its military intervention in Ukraine, a White House official said.

The group discussed ways to "reinforce that the Russians still have an opportunity to take immediate steps to de-escalate the situation or they face further political and economic repercussions from the international community," the official said about the meeting.

"The president will continue to receive regular updates on the situation, and to remain in close contact with his foreign counterparts," the official said.