Since you asked, "I still don’t know what should I’ve done" should read "I still don't know what I should have done."

"because there are people who are worse now." should read "because there are people who are worse off now."

But your English is very good, and we all understood what you meant to say. I agree that Putin is another Hitler, and we saw where appeasing Hitler took us in the 1930's. Some appear to have forgotten that lesson.