Russia`s upper house of parliament on Friday unanimously voted to ratify the treaty incorporating Crimea into Russian territory in defiance of the international community`s insistence that the peninsula is part of Ukraine.
The UN Security Council has held an "urgent" meeting to discuss the deteriorating situation in Ukraine, asking all political actors in the strife-torn country to exercise maximum restraint and resolve issues through inclusive dialogue.
Militant anti-government activists in Ukraine on Saturday threatened to storm the President`s palace and shatter a fragile peace deal to end the ex-Soviet country`s bloodiest crisis since independence.
Russia warned Ukraine`s president not to let opponents walk over him "like a doormat", its strongest signal yet on Thursday that Moscow wants order on the streets before handing over more cash to stave off bankruptcy.
The United States on Wednesday called the deadly violence on the streets of the Ukrainian capital "completely outrageous" and renewed its appeal to President Viktor Yanukovych to de-escalate the situation.
Ukrainian President Viktor Yanukovich accused pro-European opposition leaders on Wednesday of trying to seize power by force after at least 26 people died in the worst violence since the former Soviet republic gained independence.
EU foreign policy chief Catherine Ashton was set on Wednesday to meet Ukrainian President Viktor Yanukovych amid opposition accusations the embattled leader was dragging his feet over proposals to resolve a crisis.