What happens if I walk around with a large portrait of Trump and Russian inscriptions in New York? I'm from Russia?

The loving and tolerant liberals will attack you.

Are you planning to do it while naked as a Jay bird? In that case, you'll just get arrested and tossed into a psych ward for evaluation. 

Otherwise, its STILL a free country,  walk around with whatever you want.  No one can stop you from looking stupid, if thats what you want to do.

This is a free country you can do it, I might add that you did say New York so it’s under democratic tyranny at this time,