At least 32 miners were killed after an explosion in a coal mine in rebel-held territory on Tuesday.
The head of Russia’s Security Council accused the U.S. of funding Russian opposition groups.
Days ahead of the first anniversary of the aircraft's mysterious disappearance, Tony Abbott hinted that the search may be scaled back.
In a speech before the Security Council, the Libyan ambassador said the world has not done enough to stop the spread of terrorism.
Boris Nemtsov's allies have pledged to publish a report he was working on at the time of his death.
The U.S. military will arrive in Romania and Bulgaria before expanding operations to other regions of Eastern Europe.
At least 17 deaths at a Ukraine coal mine Wednesday bring the 15-year death toll there to more than 300.
Many opposition members and Kremlin critics accuse the Russian president's inner circle of orchestrating Boris Nemtsov's murder.
Graham indicated interest in a run for president in January, but South Carolina voters say he should skip 2016.
A miner, Sergei Baldayev, said five bodies had been retrieved from the area of the blast, in a shaft deep underground.
Before his death, Boris Nemtsov, a vocal critic of Putin, had been organizing an upcoming rally in protest of the conflict in eastern Ukraine.
Army Gen. Martin Dempsey said the U.S. should consider giving “lethal aid” to Ukraine in its fight against pro-Russian separatists.
White House spokesman Josh Earnest said Obama condemned Russia for not following through on its agreements in a video conference call with European leaders.
Ukraine says rebels violated the ceasefire six times between Monday and Tuesday.
The economic crisis has been particularly felt in Donetsk, where goods are scarce and prices have soared.
Iran must commit to a verifiable freeze of at least 10 years on sensitive nuclear activity for a landmark deal to be reached, but the odds are still against sealing an agreement, Obama told Reuters, an exclusive report says.
Cameras were either turned off or failed to capture relevant footage when Russian opposition leader Boris Nemtsov was killed, reports say.
Romania relies almost entirely on Russian gas imports through Ukraine and a shutoff there would have a domino effect.
Some of the ships, like Russia's latest nuclear submarines, are new. Others are to be refurbished and upgraded.
Anna Duritskaya, 23, is purported to be the lone witness to the Russian opposition leader's killing.
A gas dispute is becoming increasingly contentious ahead of planned talks around Europe over the crisis in Ukraine.
Inna Duritskaya also claimed that Russian President Vladimir Putin is trying to link the murder to the conflict in eastern Ukraine.