I am not Russian, and have nothing to do with Russia or Ukraine or whatever (I am Brazillian, of Iberian descent).
Still, Crimea was not a "invasion" or "conquest".
Long story short:
Russia invaded Crimea in 1700s, taking it from Tartars.
When a Ukranian became leader of URSS, he "gave" Crimea to Ukraine, it was only nominal, nothing changed in Crimea itself, the place still was basically a navy base for Russia.
When URSS broke up, because of previous decision, it was decided Crimea was Ukranian, except most of population there is Russian (including a huge amount of Russian military), and their only warmwater seaport deep enough for the good warships Russia had, was still there, to make this work, Russia "rented" the place from Ukraine.
When Ukraine most recent revolution happened, do you think all the Russian military personel families that live there since 1700s would want to leave?
Now... if you want to claim what is happening in Donbass is a invasion, then that is more plausible.
