U.S. President Donald Trump blamed "U.S. foolishness and stupidity" for bad relations between Washington and Moscow, hours before he was to sit down to a one-on-one meeting with President Vladimir Putin.
The Russian foreign ministry "liked" Trump's comments on Twitter, which denounced the investigation into Russian meddling in American elections as well as previous U.S. policy.
"Our relationship with Russia has NEVER been worse thanks to many years of U.S. foolishness and stupidity and now, the Rigged Witch Hunt!" wrote Trump.
The Kremlin said it did not expect much from the meeting but hoped it would be a "first step" to resolving a crisis in ties.
"Presidents Trump and Putin respect each other and they get along well," Kremlin spokesman Dmitry Peskov said. "There is no clear agenda. It will be determined by the heads of state themselves as they go along."
Critics and Trump's own advisers have urged Trump to use the summit to press Putin hard about "malign" activities, from annexing Ukraine's Crimea peninsula to interfering in Western elections, to poisoning a spy in England, which Moscow denies.
During a breakfast meeting with Finland's president before the meeting with Putin in the Finnish capital, Trump appeared upbeat. Asked what he would say to Putin, Trump said: "We'll do just fine, thank you."
Trump and his wife Melania returned to their hotel after the breakfast and were expected to remain there for a few hours. Putin was due in Helsinki around lunch time. The two leaders will meet one-on-one with only interpretors, followed by a working lunch accompanied by advisers.
While Trump has been abroad since last week, the special prosecutor investigating allegations that Russia interfered to help him win the 2016 presidential election indicted 12 Russians on Friday for stealing Democratic Party documents.
Trump's foes at home have been scathing about his apparent refusal to criticise Putin. His 2016 opponent Hillary Clinton tweeted: "Great World Cup. Question for President Trump as he meets Putin: Do you know which team you play for?"
Russia denies interfering in the U.S. presidential election. The state RIA news agency quoted a Russian source as saying Moscow was "ready to discuss, ready to undertake mutual obligations of non-intervention into internal matters".
Trump has said he will raise the election meddling but does not expect to get anywhere. He has repeatedly noted that Putin denies it, while also saying that it is alleged to have taken place before he became president.
For Putin, that the summit is even happening despite Russia's semi-pariah status among some Americans and U.S. allies is a geopolitical win.
The countries are expected to discuss the prospect of extending a nuclear disarmament treaty, and the war in Syria, where Russian-backed forces of President Bashar al-Assad have advanced in the south of the country in recent weeks despite a ceasefire brokered by Moscow and Washington under Trump.
The summit caps a trip abroad during which Trump sternly criticised NATO allies for failing to spend enough on their militaries and embarrassed British Prime Minister Theresa May by saying she refused to take his advice about how to negotiate Britain's exit from the EU. He referred to the European Union itself as a "foe" in trade, and repeatedly criticised it.
In some of the strongest words yet reflecting the unease of Washington's traditional allies, Germany's foreign minister said on Monday Europe could not rely on Trump.
"We can no longer completely rely on the White House," Heiko Maas told the Funke newspaper group. "To maintain our partnership with the USA we must readjust it. The first clear consequence can only be that we need to align ourselves even more closely in Europe."
Trump has predicted he will be accused of being too soft on Putin no matter how the summit goes. "If I was given the great city of Moscow as retribution for all of the sins and evils committed by Russia...I would return to criticism that it wasn’t good enough – that I should have gotten Saint Petersburg in addition!" he tweeted on Sunday.