“The majority of Ukrainian refugees, however — several million — have fled to regions controlled by Kyiv and abroad.”
The above being the case, the Ukraine govt. should try to contact as many of these people who can be proven as recent residents of these Putin referendum areas to also vote. This could be done by using addresses of tax payments or social security or other official Ukraine govt. contact addresses.
In addition the Ukraine govt. could appeal to the UN to supervise the vote count of all such votes collected by the elected Ukraine govt. If Russia would veto such a UN activity it would prove the SOBs they are to everyone.
Several countries have agreed to monitor.
I will see if I can find that info.
“The above being the case, the Ukraine govt. should try to contact as many of these people who can be proven as recent residents of these Putin referendum areas to also vote.”
Why would they want to do that and give any veneer of legitimacy to an illegal referendum?