The U.S. waits to hear a reaction from Moscow as new tougher sanctions go into effect. Tracie Potts reports.
Ukrainian Prime Minister Arseniy Yatsenyuk has announced his resignation.
Ukrainian separatists hand over bodies of Malaysia Airlines passengers as EU considers sanctions against Russia. Steve Handelsman reports.
President Obama calls for pro-Russia Ukrainian separatists to open site of Malaysia Airlines crash. Steve Handelsman reports.
As the international investigators are struggling to get access to the Malaysian Plane crash site, many wonder how much evidence has been tampered with or lost. Danielle Leigh reports.
Intercepted phone calls purportedly between Russian military intelligence officers and members of a pro-Russian separatist group that appear to capture the moment the rebels realized the plane they shot down was a civilian passenger plane could be the smoking gun that helps prove Malaysia Airlines Flight 17 was downed Ukraine by the insurgents.
President Barack Obama said Friday that at least one American citizen was killed in the crash of a Malaysian Airlines passenger jet near the border of Ukraine and Russia.
President Obama is trying to use U.S. influence to calm to areas of conflict. Brian Mooar reports.
Malaysia Airlines jetliner with 295 people on board was shot out of the sky over Ukraine on Thursday by a surface-to-air missile, U.S. officials told NBC News.
President Obama and Russian President Vladimir Putin meet briefly during D-Day celebrations as tensions over Ukraine simmer.
As the situation continues to deteriorate in the Ukraine, Washington lawmakers grapple with their next steps as sanctions have been largely ineffective.
Congress considers bill offering aid to Ukraine.
New U.S. intelligence assessments say there are more indications than ever that Russia could invade eastern Ukraine, as congressional lawmakers reacted with alarm to Vladimir Putin's rapidly expanding military buildup along the border.
The U.S. and its allies announced Monday that they would, for now, exclude Russia from the G8 and boycott a planned summit in Sochi in retaliation over its Crimea takeover.
President Obama announced Thursday that he is imposing sanctions on additional senior Russian officials and others over the country's annexation of Crimea.
Russia reportedly is prepared to change its stand on Iran nuclear talks in a high-stakes gamble to counter expanded sanctions by the United States and the European Union over Crimea.
Secretary of State John Kerry meets with Russian Foreign Minister Sergey Lavrov to discuss the ongoing crisis in Ukraine.
The new Ukranian Prime Minister makes the rounds on Capitol Hill as some lawmakers head to the Ukraine to strenthen ties with the new government.
A joint naval exercise of U.S., Bulgarian and Romanian naval forces in the Black Sea has started, the Bulgarian navy said on Wednesday.
President Obama meets with the new Prime Minister of the Ukraine to talk about the country's future.