The article states:

A third government official briefed on the meeting defended the president, saying Mr. Trump was using a negotiating tactic when he told Mr. Lavrov about the “pressure” he was under. The idea, the official suggested, was to create a sense of obligation with Russian officials and to coax concessions out of Mr. Lavrov — on Syria, Ukraine and other issues — by saying that Russian meddling in last year’s election had created enormous political problems for Mr. Trump.


Well, that's very believable and I see nothing wrong with that.