No it is very relevant. The state of Ukraine and its borders is a construct of the Soviet Union. Hence what that drunk ruler did is very relevant. The borders of Ukraine today is built across genocide, the fancies of Soviet leaders and in total disregard of the ethnic populations on the ground... very colonial of the Soviet Union... Western Ukraine with the city of Lviv was part of Poland for almost 1000 years, but thanks Ukrainian nationalists during WW2.. the native Poles in the city and the whole region were butchered while under Nazi control after the Soviets had annexed the area in 1939 and the Nazis invaded. So yes it is very relevant.. because Polish nationalists have been moaning about it for years.. wanting back old Polish areas in Belarus and Ukraine....
Again.. go look at an election map (2010 and back) from before the uprising in 2014. Crimea consistently elected pro-Russian candidates and selected the "Russian" candidate by 75%+. Only Donetsk, Luhansk and the city of Sevastopol had higher % voting for "Russian" presidential candidates than Crimea.. and what regions started the rebellion in? ohhh lets see.
So yes, it has never been Ukrainian, and never will be. It has been Russian, Polish-Lithuanian, Ottoman, Genoese, Mongol (various versions), Byzantine/Roman, Tatar.. but never ever Ukrainian people been there in any large numbers and only because of one drunk Soviet leader, was it transferred to the soviet made up "Ukrainian Republic" in the 1950s.
A peace deal of any sort, will have to tackle not only current day problems, but many of those problems are the result of issues created by the Nazi-Soviet alliance, the Soviet Union and even the freaking Czar before that. History can NOT be ignored in this case.. that is just a fact.