Where Ukraine is wrong IMHO, is to desire NATO membership. I won't be surprised if Russia expands the war to other NATO countries. They have it coming.
NATO has a mutual defense agreement.
If Russia invades a NATO member, & poses an existential
threat to this nation, it would rightfully & certainly use all
weapons at its disposal.
Even for non-nuclear nations, this would include nukes
from other members.
Nuclear sharing - Wikipedia
NATO has not invaded Russia. You propose that Russia
invade NATO because of its increasing power. This would
signal Russian designs on all of Europe, & the end of
negotiating for peace.
Do you really believe that they "have it coming", given the
likely consequences of defense, & escalation to nuclear
warfare, with USA, Britain, France, Germany, etc vs Russia?