The rift between (Ukraine's President / the Ukrainian President) Zelensky and (the American President / President) Trump deepened, as Zelensky was claimed aTrump claimed that Zelensky is a dictator by Trump.

In English, just "President" on its own is usually assumed to refer to the American President. If you want to specify that it's the american president specifically, you need the "the".

Interestingly, I am a bit curious why Putin, Xi or the North Korean leader have never been seen as authoritarian by him, these leaders seemed to be praised by Trump.

The rift between Ukraine President Zelensky and American President Trump deepened, as Trump claimed that Zelensky was claimed as a dictator by Trump.

It sounds a little better without passive voice here.

Interestingly, I am a bit curious why Putin, Xi or the leader of North Korea leader have never been seen as authoritarian by him, these leaders. He seemeds to be praised these leaders.

The rift between Ukraineian President Zelensky and American President Trump has deepened, as Zelensky was claimed asto be a dictator by Trump.

Interestingly, I am a bit curious why Putin, Xi or North Korea's leader have never been seen as authoritarian by him. Intead, these leaders seemed to be praised.

I agree with the previous correct given on this post as saying "interestingly" feels redundant

The rift between Ukraine President Zelensky and American President Trump deepened, as Zelensky was claimed asto be a dictator by Trump.

Interestingly, I am a bit curious why he never sees Putin, Xi or North Korea’s leader have never been seenship as authoritarian by him,. Instead these leaders seemed to be praisedheld in high esteem by him.

You state you are “curious” about the following point, so “interestingly” doesn’t need to be included.