Ukrainian parliament deputy Nadia Savchenko has written an open letter to U.S. President Elect Donald Trump urging him to step up anti-Russian sanctions rather than lift them.

Savchenko posted her letter on Facebook.

"I appeal to you with the kindly request to maintain and even to strengthen sanctions for Russian Federation because this country understands only force and resolve that you really have personally and your country has as a World Leader," she said.

"I also ask for international diplomatic, technical, military support of Ukraine. I also ask for the most drastic actions of U.S. politics, your future President Administration for making free Ukrainian hostages from Russian prisons," Savchenko said.

"I'd be very thankful for your possible future answer where you may explain to Ukrainians and to all World Nations the main points of your future President Administration steps on these questions," she said.