DAY 120: Trump bragged to Russian officials he fired Comey and that took "pressure" off him

Donald Trump bragged to the Russian officials he met with at the White House on May 10 that he had fired James Comey, and that the firing of Comey took "great pressure" off Trump because of the Russia investigation.

The contents of the meeting were revealed by The New York Times, citing an internal White House document with the notes of the meeting. From the NYT article:

President Trump told Russian officials in the Oval Office this month that firing the F.B.I. director, James B. Comey, had relieved “great pressure” on him, according to a document summarizing the meeting.

“I just fired the head of the F.B.I. He was crazy, a real nut job,” Mr. Trump said, according to the document, which was read to The New York Times by an American official. “I faced great pressure because of Russia. That’s taken off.”

The account came from a document that "contained Mr. Trump’s comments was based on notes taken from inside the Oval Office."

The document's accuract was confirmed by two White House officials and Sean Spicer did not dispute it.

Why would Trump feel "pressure" if he insists that he didn't collude with Russia?

Perhaps because he did collude with Russia?