Russia didnt invade Ukraine, they are at a civil war with U.S. backed ukrop nazis trying to genocide east ukraine where the locals are mainly ethnic Russians, the U.S. govt/cia tries to trigger Russia into a conflict, but they failed since miners and peasants with 40year old equipment managed to defeat their nazi army, most the regular Ukrainian army wont take part in that genocide only the cia paid nazi mercs.

And finally Russia didnt invade Crimea either, they were legally stationed there since its the home for the Russian Black Sea Fleet, always was and always will be, the Russians only secured their people and assets in Crimea against a U.S. backed coup in Kiev, no civs were killed and there is peace there now contrary to east ukraine.
Crimea was always part of Russia except between 1954-1991, they had three referendums since 1991 with every time voting for secession from Ukraine, they were ignored every time by the govt in Kiev, Crimea has a majority Russian population as well, Russia has every right to defend their people and assets against nazi/U.S. agression.