President Barack Obama will work together with European leaders in co-coordinating further sanctions on Russia, after agreeing the country has "escalated tensions" in eastern Ukraine, the White House said in a statement.
President Obama has agreed to join David Cameron, France's President Francois Hollande, German Chancellor Angela Merkel and Italy's Prime Minister Matteo Renzi to "co-ordinate additional steps to impose costs on Russia."
"Russia could still choose a peaceful resolution to the crisis," the statement added.
European Union foreign ministers added 13 people to their visa ban and asset freeze list over Ukraine's crisis.
Well that’s the voting over, and no surprises so far. A ‘Yes’ vote claimed to be 89% in Donetsk, and suddenly Ukraine is no more.
Nearly 90 percent of voters in eastern Ukrainian region voted for self-rule, the head of the separatist election commission said.