Photo from twitter.com/APUkraine

"Ukraine congratulates Donald Trump on inauguration as 45th U.S. President," Poroshenko tweeted.

"Wishing success to fulfill noble goals of leading the free world."

Donald Trump was sworn in as the 45th president of the United States on Friday, succeeding Barack Obama and telling a bitterly divided country he will pursue "America First" policies at home and abroad, Reuters said.