"Ukraine is on the cusp. What happens in the next year is likely to determine the fate of this country for generations," he said at a joint press conference with Ukrainian President Petro Poroshenko in Kyiv on Monday.

"You have a free, prosperous and democratic society because your people are so brave, they have put so much into this, they deserve no less, and I know this is your obligation and objective as well, and we want to help in any way we can," Biden said.