But the announcement of the scuttled meeting came an hour after he told reporters that he would probably meet with Putin there, and two hours after Trump's ex-lawyer Michael Cohen pleaded guilty to lying to Congress about the president's involvement in an aborted real-estate deal in Moscow.
But on Thursday morning, the Kremlin confirmed that Trump and Putin would indeed meet at the G20 on Saturday at noon.
In a phone call with Turkish counterpart Recep Tayyip Erdogan, Trump expressed "deep concern" at the incident, the White House said on Wednesday.
The meeting between Trump and Putin is set to be just one of several high-profile foreign-policy engagements for the USA leader on the whirlwind two-day visit to Argentina.
Trump on Thursday cancelled a planned meeting with Putin in Argentina.
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The ongoing probe of Trump's alleged links with Russian Federation inside the USA, together with Russia's strained relations with Ukraine, has made the high-profile scheduled meeting a subject of uncertainty and sensitivity on the United States side, ever since Moscow and Washington announced it before Trump's trip to France earlier this year. Trump sent in his response to Mueller before Cohen made his stunning admission on Thursday-although the president's lawyers surely were aware of news reports last spring that prosecutors had emails showing that Trump's business negotiations with Russian Federation were ongoing.
"I look forward to a meaningful Summit again as soon as this situation is resolved!" he added. But White House aides were still planning for the Putin meeting after Trump's comments. "It is a domestic political situation that matters for Trump for he has been under huge pressure in relation to the Mueller investigation, the midterm election, the issues with Mexico and all that", Bystritsky said. "I think it's a very good time to have the meeting", Trump told reporters before leaving Washington to fly to Buenos Aires.
Mr Putin added that the Ukrainian president's decision to impose martial law after a mere "border incident" had not even taken place at the height of the conflict with pro-Russian separatists in eastern Ukraine in 2014.
Mr Trump had also said he would get a final report during the flight to Argentina on the tension in the region after Russian Federation seized the Ukrainian vessels.
"I would have suggested a different way", Director of National Intelligence Dan Coats said at the time.
He said he hoped Berlin could intervene with Ukrainian authorities "to dissuade them from further reckless acts".
On the ground for just two days, Trump is packing every moment with diplomacy, conducting bilateral meetings with numerous world leaders as well as group events.