authorities have asked Russians living in the country who they think rightfully owns Crimea, and their views on the Ukraine war.
This is McCarthyism. Crimea is obviously rightfully part of Ukraine and anyone who thinks otherwise is wrong according to international law and the considered opinion of the international community - but being wrong shouldn't be illegal. Governments should absolutely feel free to deport those Russian citizens who are actively acting on behalf of a hostile foreign government, but simply being both Russian and a moron doesn't mean you're automatically acting as an agent of Putin.
And what about those Russians in Lithuania who have loved ones back home or who may want to return to Russia one day, who have to outwardly not be critical of the regime even if that's not what they actually believe - how should they respond to these questionnaires?
You don't beat the bad guys by behaving like the bad guys. Privately held opinions should not be criminalised.