The Ukrainian government on Sunday launched an "anti-terrorist" operation in an eastern city where armed pro-Russian men seized police and security services buildings, Interior Minister Arsen Avakov said.
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."
U.S. Secretary of State John Kerry on Tuesday accused Russian agents of stirring unrest in eastern Ukraine that could be used as a pretext for military intervention.
Ukrainian Prime Minister Arseny Yatsenyuk on Monday accused Russia of stirring up a fresh wave of unrest by fomenting separatist sentiment in eastern Ukraine.
The North Atlantic Treaty Organization (NATO) has been desperately seeking to find a new geopolitical opponent in order to cement the alliance, and the Ukrainian situation was their perfect chance to move in that direction, a high-ranking Russian diplomat said Monday.
Any further Russian efforts to destabilize Ukraine will incur costs for Russia, U.S. State Secretary John Kerry warned Russian Foreign Minister Sergei Lavrov on Monday.
U.S. space agency NASA has suspended all contacts with its Russian counterpart Roscosmos except for ongoing activities aboard the International Space Station (ISS), according to an internal letter published by the U. S. space news website Spaceref on Wednesday, citing U.S.-Russian tensions over Ukraine and Crimea.
Ukraine on Monday urged Russia to stop interfering in its internal affairs in response to Moscow's calls on Kiev to establish a federal form of government.
Senior Russian officials have denied that the country intends to build a network of military bases abroad, but confirmed Moscow was in talks with several countries over the creation of logistics facilities for its naval ships.
U.S. President Barack Obama on Thursday announced new sanctions against senior Russian officials and a bank in a move to "impose additional costs" on Russia.
U.S. President Barack Obama said on Wednesday that the United States would not take military action in Ukraine against Russia.
Following a briefing by senior UN officials recently returned from Ukraine, a rather undiplomatic debate erupted Wednesday in the UN Security Council between Russia's ambassador and other members of the council as well as the envoy from Kiev.
U.S. President Barack Obama and German Chancellor Angela Merkel condemned on Tuesday Russia's moves to formally annex Crimea.
The Crimean parliament declared independence from Ukraine on Monday, after official results showed 96.77 percent of Crimean voters chose to join Russia in Sunday's referendum.
President Barack Obama said on Sunday the United States will not recognize the Crimean referendum, vowing to impose fresh sanctions on Russia.
U.S. Secretary of State John Kerry on Thursday threatened "a very serious series of steps" against Russia with the European Union in response to Crimea's vote on Sunday to break away from Ukraine.
Russian Foreign Minister Sergei Lavrov said Monday that Moscow was not satisfied with U.S. proposals on settling the Ukrainian political crisis, and has drafted its own document to "put the situation on the basis of international law."
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