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From living in Ukraine for 10 years, no one will stop you living in Ukraine, if you are a citizen of different country you might have trouble coming back if you stay for too long though. Ukraine does not officially recognize dual-citizenship, but neither will Ukraine take away your citizenship from another county if you ever chose to become a citizen of Ukraine.
Yes, if you will stay up to 90 days in Ukraine, you do not need Ukrainian visa. The same not only for USA citizens, but also for citizens of EU countries, Canada, Norway, Switzerland and Japan.
my advice is he should because if he is married to a legal citizen he should get the same rights.
a USA citizen can stay in Japan for up to 90 days without a visa
No if you are from the United States, Canada or European Union.
As long as your visa is valid
Nothing happens except that you will be married happily to the US citizen. You need to get married only within 90 days of entering the US and 60 days is perfectly fine.
i think 6 months
You do not need a visa for a stay of max. 90 days.
Not for a stay of max. 90 days.
YES
Yes, almost of European countries can enter Ukraine without visa for maximum period of 90 days stay. Since the the standard study period is minimal of 1 year duration, then this will require a long term visa of 1 year duration. Source: see related link