Donald Trump and the Russian President's Relationship Explained

This is a play on words using 'Putin' as a verb. The joke implies a sexual relationship between Donald Trump and Vladimir Putin, suggesting that Trump is letting Putin 'put in' his 'dick' where it shouldn't be, which is a crude way of saying he is being influenced or controlled by Putin. The joke relies on the listener being aware of the real political tensions between the U.S. and Russia.