Russia's Finance Ministry says Ukraine has failed to repay a $3 billion Eurobond debt owed to Russia by December 21.
Russian news agencies have reported that a powerful explosive device went off late on December 21 in the city of Donetsk, in conflict-torn eastern Ukraine.
A Russian opposition activist who became the first person charged under a strict new protest law has reportedly fled to neighboring Ukraine, where he will seek political asylum.
Police and eyewitnesses say three rockets hit an area of the Afghan capital, Kabul, that houses many foreign embassies and government buildings late on December 21.
Moldovan President Nicolae Timofti has asked a pro-Western businessman and former prime minister to form a new cabinet amid a protracted political and economic crisis in the former Soviet republic.
The Russian military says the "black box" from a warplane shot down by Turkey last month is too badly damaged to be deciphered, at least without additional work.
A damning report by Human Rights Watch says the use of cluster munitions has soared in Syria since the start of the Russian-Syrian military offensive.
The European Union has extended sanctions against Russia for another six months.
Police in Belgium say they have detained five people for question in an investigation linked to militant attacks in Paris that killed 130 people in November.
Russian President Vladimir Putin has hailed Moscow's links with Kazakhstan just hours before Astana signed a deal on closer ties with the European Union.
The Russian Defense Ministry has announced that more military hardware has been deployed to reinforce its air base in Armenia.
The central bank in Azerbaijan has abandoned its currency peg and floated the manat, following a similar move by Kazakhstan earlier this year.