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Justice4All The US wasn't invaded during the Vietnam War, so it's not comparable. However, the 1918 Sedition Act made it a crime to disparage the government during wartime. It was repealed in 1920, but there was very little resistance to it while it was in effect. The Alien and Sedition Acts of 1798 were even more repressive, and they were enacted while many of the Founding Fathers were still in power. The First Amendment right to free speech isn't unlimited, as our former president is about to find out if he tries that defense in court.
Since Russia invaded Ukraine, everything Ukraine is doing is defensive. The parts of Ukraine you mentioned, with the exception of Crimea, are currently being occupied by Russia illegally, and the "vote" in those areas isn't recognized by any other country except Russia. If Ukraine invades Russia, that would be an offensive action.
I don't live in Ukraine, so I have no say in how long Zelenskyy stays in office. Maybe when the war ends he will call for new elections. How long does Putin get to stay in power? Shouldn't the same rules apply to him?