Ukraine is now on the cusp and its fate depends on what will happen next year, U.S. Vice President Joe Biden said.

"It is true I've only been here four times in two years. But I think we may have logged close to 1,000 hours on the telephone. I think I tend to be more in direct conversation for longer periods of time with the president than with my wife. I think they both regret that. But it is important," he said after talks with Ukrainian President Petro Poroshenko in Kyiv on Monday.

"Ukraine is on the cusp here. Ukraine is on the cusp. What happens in the next year is likely to determine the fate of this country for generations. 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," he said.