This is the long tail of socialist policies and fellow travelers in the West (places like the NYTimes and various academia, suppressed the truth about Lenin and Stalin back in the day).
But yes, the truth is that Stalin completely eradicated the Ukraine people in Crimea and replaced them with Russians. The NYT and others in the left wing media knew about this and refused to report on it at the time. Moreover the people of the Donbas have ever since the October Revolution dreamed to be independent from either Ukraine or Russia.
Moreover Crimea is the only place the Russians have access to a waterway that connects to the oceans that isn’t controlled by NATO or frozen every winter.
The question is thus, given the past 10 years Ukraine has been fighting a civil war against independence in Donbas and given Ukraine can’t hold a majority Russian Crimea, what is the end goal. The best option could be to get out with a negotiated deal (by China, because Biden is too weak) where they give up claim to Crimea and Donbas and let the Donbas be an independent “new” buffer country.
Giving them F16s means they can fly into Russia, which Russia would see as an escalation. Then again, trying to re-take Crimea will be very bloody. At this point Ukraine hasn’t lost anything yet land. The Donbas was already opposed, Crimea was already lost.
To Russia, invading Ukraine cost them relatively very little Ukraine lost over 25% of its forces, they lost most of their gear that wasn’t donated by the US and another 20-30% of military aged reserves were lost to emigration and with that a generation of potential military recruits - the Russians lost less than 5% of their active military and gear, not even counting reserves. Russia thus eliminated the threat of having them invade through the Donbas or Crimea for the foreseeable future. Russia completed its goals, Ukraine and the Biden admin is refusing to end it.