The Russian leader had two brief meetings with Trump on the sidelines of worldwide summits previous year, but plans for a full-fledged summit have been thrown back amid the USA investigations into alleged collusion between Trump's campaign and Russia by Congress and special counsel Robert Mueller.
The meeting will follow Trump's visit to Brussels for a North Atlantic Treaty Organisation summit as well as his first official visit to the United Kingdom.
NATO Secretary-General Jens Stoltenberg welcomed the US-Russian summit, saying that "for me, dialogue is not a sign of weakness". We don't want to isolate Russian Federation.
Finland served as a venue for a 1975 meeting between US President Gerald Ford and Soviet leader Leonid Brezhnev and also hosted a summit between U.S. President George H.W. Bush and Soviet President Mikhail Gorbachev in 1990.
Bolton, before joining the Trump administration, said Russia's election interference was "truly an act of war" against the U.S., and that a policy based on trusting Russian Federation was "doomed to failure".
A Trump-Putin meeting in Finland - if it were to happen - would be yet another foreign policy coup for the USA president.
It's unlikely, however, that the subject of Russian meddling in USA elections will be included in the summit's agenda.
Rep. Adam Kinzinger (R-Ill.), a member of the House Foreign Affairs Committee, told CNN on Monday that he has "no problem" with Trump and Putin sitting down, yet Trump has to "go in from a position of strength". "I think a lot of good things can come with meetings with people".
Ukraine wants Russia to return the annexed Crimea region and for pro-Russian separatists in eastern Ukraine to hand back control of territory.
Trump has long expressed a desire for better relations with Moscow, even as Washington tightens sanctions.
Sen. John Kennedy listens during the first day of the Senate Judiciary Committee confirmation hearings for Neil Gorsuch to be associate justice of the Supreme Court, March 20, 2017.
"Russia continues to say they had nothing to do with Meddling in our Election!"
"If he meets with Putin and he doesn't bring up the elephant in the room about what they've done to undermine democracy here and all over the world, it would be a big mistake", he said.
"Probably there was meddling from other countries, maybe other individuals", Trump said, echoing the infamous comment he made during one of the presidential debates about how a "guy sitting on his bed who weighs 400 pounds" may have been responsible for Democratic hacks, not Russian Federation.
Democrats said the meeting was a gift to the Kremlin and anxious what else Trump might give away.