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.
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.
Russian President Vladimir Putin urged the country on Monday to ratchet up a fight against terrorism and extremism, saying radicals still have the chance to endanger civilians.
Ukrainian Prime Minister Arseny Yatsenyuk on Monday accused Russia of stirring up a fresh wave of unrest by fomenting separatist sentiment in eastern Ukraine.
Russia is "disappointed" at Norway's decision to suspend programs for bilateral military cooperation, part of the sanction measures Norway imposed following Russia's annexation of Crimea, the Norwegian news agency NTB reported on Monday.
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.
Russia is a global power not a regional one, a senior Russian parliamentarian said Wednesday.
Russia dismissed reports on Tuesday that it was allegedly mobilizing troops to its border with Ukraine after the absorption of Crimea, a former Ukrainian republic.
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.
Ukraine on Tuesday appealed to the Budapest Memorandum guarantor countries to set up an emergency commission to de-escalate the ongoing crisis in the country.
U.S. President Barack Obama and German Chancellor Angela Merkel condemned on Tuesday Russia's moves to formally annex Crimea.
Britain has suspended all military cooperation with Russia and halted all extant licenses for direct military export to Russia, British Foreign Secretary William Hague said Tuesday.
Russian President Vladimir Putin has signed a decree to recognize Crimea as a sovereign and independent state, the Kremlin press service said Monday.
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.
Japan on Tuesday imposed sanctions on Russia over crisis related to Crimea, according to Japan's Foreign Ministry.