Kiev is hoping Mr Trump will push Mr Putin on the confrontation, which began on Sunday (Nov 25) when Russian Federation fired on Ukrainian ships trying to enter the Kerch Strait, a crucial waterway separating the Black and Azov seas.
Kiev is banking on its Western allies to provide military support to contain Russian Federation, which it says is preparing to invade its territory by land.
But the decision to cancel the Putin meeting came just a few hours after Trump's former personal attorney, Michael Cohen, pleaded guilty in special counsel Robert Mueller's Russian Federation investigation, admitting that he'd lied to Congress about a project to build a Trump Tower in Moscow. "I think it´s a very good time to have the meeting", he had said.
The United States and its allies later condemned the move at the United Nations.
Trump said in their meeting, he'd discuss trade and military purchases with the Argentine president.
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 U.S. side, ever since Moscow and Washington announced it before Trump's trip to France earlier this year.
That session will lead into the large gathering of the G20, where Trump will find himself face-to-face with the collection of global leaders he has sometimes rebuffed.
She did not say why the meetings with Recep Tayyip Erdogan and Moon Jae-in had been downgraded.
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German Chancellor Angela Merkel blamed the crisis "entirely" on Russian Federation. She did not offer any explanation for those changes to the schedule.
"Witch hunt" is the term the president routinely uses to denigrate Mueller's investigation into Russia's role in the 2016 campaign and whether or not there was coordination with Trump's campaign, which the president has repeatedly denied.
"Though it was Trump's personal decision and it is entirely consistent with anti-Russian politics". But he seemed to reverse course as he left the White House on Thursday, telling reporters that the meeting with Putin was still on.
Trump tweeted his decision from Air Force One shortly after his former lawyer, Michael Cohen, revealed he had lied to Congress to cover up that he was negotiating a real estate deal in Moscow on Trump's behalf during the Republican presidential primary in 2016.
"However, the reason for our canceled meeting is Ukraine", Sanders made clear.
Although, Mr Putin's lavish purchases go someway to detailing his financial situation.
"We condemn this demonstration of barbarism and are multiplying our efforts to bring our boys home", Ukrainian Prime Minister Volodymyr Groysman said on Twitter after the court rulings.
The stakes for the sit-down between Putin and Trump were raised this week by Russia's stepped-up aggression in the Kerch Strait, stemming from its years long occupation of Eastern Ukraine. I was thinking about it, but they'd like to have it.
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