Ukraine's leaders say have U.S. backing to take on "aggressors"
Ukraine's government relaunched a security operation to crack down on pro-Russian armed groups after an Easter pause on Wednesday and said it had the backing of the United States
German clinic says Tymoshenko left, will return to Kiev
Tymoshenko, a leader of the pro-Western Orange Revolution in 2004, has been undergoing medical care for herniated discs at Berlin's renowned Charite university hospital since March 7.
Obama expresses deep concern to Putin on Ukraine
The White House said Obama and Putin spoke by phone for 90 minutes, their second phone call in the past eight days over Ukraine, an escalating crisis that is presenting a new challenge to already strained U.S.-Russian relations
Obama, wary of foreign crises, faces East-West standoff in Ukraine
Obama, who has avoided entanglement in global crises where possible and focused on domestic affairs, now finds himself in the midst of the most dangerous East-West standoff since the end of the Cold War.
West voices alarm on Crimea, urges Russia to respect Ukraine sovereignty
A week after violent protests forced Russian-backed President Viktor Yanukovich to abandon power in Kiev, Ukraine's new leaders say Russia is trying to take control of the southern Crimea region