U.S. President Donald Trump and Finnish President Sauli Niinisto have met at a breakfast at the Finnish presidential residence in Helsinki on Monday morning.

"It was a comprehensive discussion at the start of an interesting day. We managed to discuss a lot of things in one hour," Niinisto said in Finnish on his Twitter in commenting on his conversation with Trump.

The breakfast was held at Niinisto's invitation at the presidential residence in Helsinki.

Trump arrived in the Finnish capital on Sunday evening to meet with Russian President Vladimir Putin.

Niinisto is expected to meet with Putin following the Russian-U.S. summit.