We have parades in Greece as well. Student parades in every town, plus military parade in Athens.
They're pretty pointless actually.
From POV, he just does that in order to show off. I think Kim does the same and so did Russia at one point, although I don't knwo if Russia still has the military parade. But it really accomplishes nothing.
I was never fan of parades and always found them pointless.
IMO, that's one of the many things that say "hey, I'm a good president, look at me", but in reality are pretty vain.