Over Ukrainian territory. For defensive purposes. Where it was originally agreed for. Crimea hasn't been Ukraine for years (even though it should be). Offensives into Russia were not part of any operational original deals.
It's not deactivating if it was never live there.
By killing everyone else except they considered acceptable it leaves only equality left. One of their goals was to remove everyone else who didn't fit into their vision leaving only those left.
It's similar to the policies that mandate various under represented groups are the only ones able to partake in various activities. Both are shitty methods of creating equal outcomes just... One is far more lethal and terrible obviously. But the same flawed logic trying to force an outcome.