US President Donald Trump called the talks between representatives of Russia, Ukraine and the United States, which will start in Geneva on Tuesday, important.

"Ukraine better come to the [negotiating] table fast. That's all I'm telling you. We are in a position we want them to come," Trump told reporters aboard Air Force One during his trip to Washington.

When asked what the American president expects from the upcoming talks, he said that that will be very clear.

These are important talks, Trump stressed.

A new, third round of Russia-US-Ukraine talks on resolving the Ukrainian crisis will begin in Geneva, Switzerland on Tuesday.