He mispronounced, or more precisely, messed up the ending of the word “our” in russian .

As a result, it ended up sounding masculine and referring to Trump, came out like "our Trump".

Although the final word was "OUR agreement with Trump".

The case is, the word "agreement" in russian is feminine. So the word "our" should have had a feminine ending. But it did not.

Source: i watched the conference and i am a native speaker.

p.s he is either tired or i dunno.. his russian was so terrible from time to time as if he was not a native speaker.

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