According to Tsar Vladimir I:

“In connection with the extraordinary situation in Ukraine, the threat to the lives of citizens of the Russian Federation, our compatriots, and the personnel of the armed forces of the Russian Federation on Ukrainian territory (in the Autonomous Republic of Crimea) … I submit a proposal on using the armed forces of the Russian Federation on the territory of Ukraine until the normalisation of the socio-political situation in the that country,” the statement said.

Sounds like he’s going for all of Ukraine. That’s a declaration of war.