If The Russian Federation Gains Operational Control Of The Government Of Ukraine, Will 43 Million Citizens Of Ukraine Be Required To Have New Passports? Russian Federation Passports?

A thought…. If the Russian Federation obtains control of Ukraine and then decides to manage Ukraine, will the 43+ million citizens of Ukraine retain their Ukrainian passports, and will other countries accept those documents as valid for travel?  Will they become solely citizens of the Russian Federation and be required to obtain a Russian Federation passport?  Will there be an option for a citizen to retain and use for international travel passports (until expiration) issued by Ukraine?  Will countries accept a passport issued by the Russian Federation to citizen of Ukraine from 5:00 am on Thursday, 24 February 2022?