The meeting at the White House was last June. Shortly after the Ukrainian president returned home, his country's anti-corruption agency stopped its investigation into Trump's former campaign manager, Paul Manafort.
Mr Poroshenko was desperate to meet Mr Trump because of what had happened in the US presidential election campaign.
In August 2016, the New York Times published a document that appeared to show Mr Trump's campaign manager, Paul Manafort, getting millions of dollars from pro-Russian interests in Ukraine.
The page appeared to have come from Ukraine's National Anti Corruption Bureau, which was investigating him. Mr Manafort had to resign.
Several sources in Ukraine said Mr Poroshenko authorised the leak, believing that Hillary Clinton was certain to win the presidency.
If so, this was a disastrous mistake - Ukraine had backed the losing candidate in the US election. Regardless of how the leak came about, it hurt Mr Trump, the eventual winner.
Ukraine was (and remains) in a conflict with Russian-backed separatists and could not afford to make an enemy of the new US president.
So Mr Poroshenko appeared relieved as he beamed and paid tribute to Mr Trump in the Oval Office.
Ukraine registered lobbyists and embassy in Washington DC to get Mr Poroshenko little more than a brief photo-op with Mr Trump. Mr Poroshenko needed something that could be portrayed as "talks".
There is no suggestion that Mr Trump knew about the payment.
As was widely reported last June, Mr Poroshenko was still guessing at how much time he would have with Mr Trump even as he flew to Washington.
The White House schedule said only that Mr Poroshenko would "drop in" to the Oval Office while Mr Trump was having staff meetings.
That had been agreed through official channels. Mr Cohen's fee was for getting Mr Poroshenko more than just an embarrassingly brief few minutes of small talk and a handshake, the senior official said. But negotiations continued until the early hours of the day of the visit.
The Ukrainian side were angry, the official went on, because Mr Cohen had taken "hundreds of thousands" of dollars from them for something it seemed he could not deliver.
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FACEBOOK COMMENTS
Wonders Okpor
Hmm... If truly he paid such huge amount of money as a bribe just to have a meeting with Donald Trump, then he didn't do the right thing at all... Imagine what will happen to his county if he spends $400,000 on development....
Endy Edeson
Well said Wonders but his meeting is targeted towards having viable bilateral relations with America so as to not suffer economic setbacks following suspicions that he supported Hillary Clinton during the US elections
Stanley Umoize
Even me that I'm not yet a celeb cannot pay such talkless of if I'm a celeb... Talkless of if I'm a president... Sometimes u have to have self pride o
Endy Edeson
That's true Stanley . Poroshenko is too shaky, Putin can never do such a thing.
He boasted that he had seen the new president before Russia's leader, Vladimir Putin. He called it a "substantial visit". He held a triumphant news conference in front of the north portico of the White House.
He boasted that he had seen the new president before Russia's leader, Vladimir Putin. He called it a "substantial visit". He held a triumphant news conference in front of the north portico of the White House.
Ogunleye Femmzy Oluwaphemi
Trrieble something is happend in this life oooooooo