It's defense because the US military industrial complex is "defending" its profit margins by creating instability far enough away that it won't affect them, but that they can profit off of

Crimeans overwhelming support Russia against the post-2014 fascist coup gov in Ukraine

People in Donbass too as you'd expect. They welcomed the Russian army as liberators in 2022 from the current fascist Ukraine gov

Defence is when you defend your country against an invader.

Wow, I Wonder why everyone that's left in the regime that deports and persecutes dissenters says they are in support of that regime?

Ukraine never invaded anybody. Giving them weapons so they can throw out the people invading them, taking their land and molesting their people is a good thing. Russia has clearly shown that the only way to get rid of the plague that is Russian soldiers on foreign soil is to kill them. That's why we have this war that Russia has chosen to engage in, and which Russia can choose to withdraw from at any time. That's why Russians are dying by the hundreds of thousands.