The United States and the European Union on Tuesday agreed on more sanctions on Russia in response to what they called its "destabilization" moves in eastern Ukraine.
Russia urged Sunday the Organization for Security and Cooperation of Europe (OSCE) and the Council of Europe to immediately evaluate the situation in Ukraine in an objective manner.
Russia has assured the United States that it will not invade Ukraine, said the U.S. Department of Defense Monday.
Vice President Joe Biden on Saturday talked with Hungarian and Czech leaders over phone to build support for slapping new sanctions on Russia amid escalating tensions in eastern Ukraine.
Secretary of State John Kerry on Thursday accused Russia of inaction in helping to ease the tense situation in eastern Ukraine, warning that the United States is ready to impose additional sanctions in response.
Russian President Vladimir Putin Thursday called "anti-terror operation" conducted by Ukrainian troops in its east "a serious crime," warning of " consequences" if Kiev used the army against its own people.
Ukrainian acting President Alexandr Turchynov on Thursday urged Russia to pull back its troops from the joint border following Moscow's announcement of military exercises in response to Kiev's "anti-terror" operation.
The Ukrainian Foreign Ministry voiced outrage Wednesday against Russia's intention to set up border controls at the straits separating Crimea from Ukraine.
Ukrainian acting President Alexandr Turchynov met U.S. Vice President Joe Biden on Tuesday to discuss ways out of the eastern European country's crisis, the parliament's press service said.
Ousted Ukrainian President Viktor Yanukovych on Monday called for immediate dialogue between Kiev and eastern regions, urging the withdrawal of armed forces from those territories.
U.S. President Barack Obama on Wednesday once again warned Russia against further destabilizing Ukraine, but said Moscow was not seeking "military confrontation."
Russia warned Ukraine not to use force on pro-Russia protesters Monday, saying it might lead to civil war, while the West continued to impose sanctions on Russia.
Russia said Tuesday it has halted the transfer of military equipment and weaponry in Crimea to Ukraine, warning the West against weapons deliveries to the crisis-torn country.
U.S. President Barack Obama and his Russian counterpart Vladimir Putin on Monday expressed sharply different views on the escalating unrest in eastern Ukraine, both urging the other side to help stop the turmoil.
The situation in southeastern Ukraine is taking a dangerous turn, the Russian Foreign Ministry said Sunday.
President Barack Obama on Thursday urged European and other allies to be prepared to join U.S. in imposing additional sanctions on Russia if it "escalates the crisis in Ukraine."
Russia and the United States had halted a bilateral nuclear safety project, which Washington had been financing for decades, local media reported Tuesday.