Finland has been a favoured location for US-Russian summits since the Cold war times, a role helped by its efforts to maintain neutral friendly ties with its huge eastern neighbour.
The summit will offer Putin a chance to try to persuade Washington to lift some of the sanctions imposed on Russia over its 2014 annexation of Crimea, its support for separatists fighting the government in eastern Ukraine and its alleged meddling in the 2016 US presidential election.
During Wednesday's meeting with Bolton, Putin argued that US-Russian relations were at a low point because of American political infighting and expressed a desire to "restore full-fledged relations based on equality and mutual respect."
Putin had two brief meetings with Trump on the sidelines of international summits last year, but plans for a full-fledged summit had been delayed amid the FBI and Congressional probes into alleged Russia-Trump ties that Trump has dismissed as a "witch hunt".
Russian officials and lawmakers warned against excessive optimism about the summit — a cautious stance reflecting Moscow's failed expectations for rebuilding ties after Trump's victory.
Trump has called for improving relations with Moscow, but his administration has imposed an array of new anti-Russia sanctions.
During Thursday's briefing, Russian Foreign Ministry spokesman Maria Zakharova warned against waiting for any quick breakthroughs resulting from the summit, noting that Moscow has "pragmatic and realistic" expectations for the meeting given the scope of issues to be addressed.
She said Russian Foreign Minister Sergey Lavrov and US Secretary of State Mike Pompeo could meet as part of efforts to prepare for the summit.
Ahead of the announcement, Trump repeated Russian denials of election interference, tweeting "Russia continues to say they had nothing to do with Meddling in our Election!"
Trump has continually parroted the Kremlin's denial of election interference, a move that has put him out of step with the findings of the U.S. intelligence community and nearly all Democrats and Republicans in Congress, who say there's clear evidence of Russian efforts to influence the 2016 US presidential campaign.
Sergei Vostretsov, a member of parliament from the United Russia party, Putin's power-base, said overcoming the sanctions should be a top issue.
"Crimea is Russian. It will never be anyone else's. One should recognise this. It's time to stop playing the sanctions policy," Vostretsov said.
Moscow resident Vladimir Markelov had a different take.
Trump and Putin should discuss "issues of mutual understanding and friendship between the countries," Markelov suggested. "What else do we need? Not war and attacks on each other. It's the most important. There shouldn't be any other issues in life."
Putin's foreign affairs adviser, Yuri Ushakov, said after Putin's meeting with Bolton that the issue of alleged Russian meddling in the US presidential election was raised in the meeting and the Kremlin reiterated its denial of any interference with the US vote.
"It was stated clearly by our side that the Russian state hasn't interfered with the US domestic politics, moreover hasn't interfered in the 2016 election," Ushakov said.
Nato Secretary General Jens Stoltenberg welcomed the US-Russia summit, saying that "for me, dialogue is not a sign of weakness. Dialogue is a sign of strength."
"It's absolutely, totally in line with Nato policies to talk to Russia, to meet with Russian leaders," Stoltenberg said. "We don't want a new Cold War. We don't want to isolate Russia. We want to strive for a better relationship."
Finland served as the venue for 1975 meetings between US President Gerald Ford and Soviet leader Leonid Brezhnev. The country also hosted a summit between US President George H.W. Bush and Soviet President Mikhail Gorbachev in 1990. In 1997, President Bill Clinton met his Russian counterpart, Boris Yeltsin, in Helsinki.
Former Soviet President Mikhail Gorbachev said this summer's Helsinki summit could go down in history as a major landmark if Putin and Trump make steps toward cooperation. Russian lawmakers were also positive about the meeting.
"The decision on holding a full-fledged summit is a very positive development," Russian upper house speaker Valentina Matvienko said Thursday in remarks carried by Russian news agencies. "We hope it will play a very important role in helping begin the normalisation of Russia-US ties."
- AP
