The United States is "ready to act" if Russia does not de-escalate tensions in eastern Ukraine, John Kerry has said.
The Secretary of State said sanctions against Russia are already taking their effect, and are "just a preview of how the free world will respond if Russia continues to escalate what they have promised to de-escalate".
"The window to change course is closing. President Putin and Russia face a choice - if Russia chooses a path of de-escalation, the international community - all of us - will welcome it.
"If Russia does not, the world will make sure that the costs for Russia will only grow."
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.