The Russian foreign ministry on Thursday issued a complaint to the German ambassador after a German minister reportedly drew parallels between Moscow's annexation of Crimea and Hitler's actions in 1938.
US Assistant Secretary Nisha Biswal declared that the United States did not expect the crisis in Ukraine to lead to resumption of the Cold War with Russia.
Moscow on Wednesday threatened retaliatory action against US diplomats after US bank JP Morgan blocked a transfer of funds carried out by a Russian envoy.
The founder of Russia's top social network VKontakte, Pavel Durov, on Wednesday said he has resigned as chief executive in a bitter conflict with a major shareholder, a dramatic announcement some initially saw as an April Fool's joke.
Ukraine reported a gradual withdrawal of Russian troops from its border that may be linked to Washington's latest push for a diplomatic solution to the worst East-West standoff since the Cold War.
Russian energy giant Gazprom on Tuesday announced it was raising the price of gas exports to Ukraine by more than a third, scrapping a previous discount amid mounting strains between the two countries.
The UN secretary general said Friday that Russian President Vladimir Putin assured him he had no intention of orchestrating further incursions into Ukrainian territory.
A Russian spacecraft carrying a three-man Russian and US crew on Friday docked successfully at the International Space Station after an unprecedented two-day delay caused by a technical hitch.
The IMF announced a $14-$18 billion bailout for Ukraine on Thursday as the UN General Assembly refused to recognise Russia's annexation of the Crimea peninsula.
Lights will go off in some 7,000 cities around the world for this weekend's Earth Hour event, which will aim to raise hundreds of thousands of dollars for environmental projects worldwide.
A little-known Chinese firm hopes to set up a facility to assemble regional jets made by Russia's Sukhoi in a multi-billion-dollar deal, state media reported.