Mobilization in most nations. Usually refers to activating Military Reserves/Militia components of the armed forces. And beginning to shift industry to wartime production.

There’s been reports for a while of Russia moving around equipment from Soviet Era stockpiles. And some hush hush work at former Soviet Military Installations. Particularly Missile and Nuclear Defense structures.

Some people are also reporting Soviet and Imperial Russia Costal Fortresses and Gun Batteries are being rehabbed and modernized. Though these reports remain unconfirmed and purely anecdotal.

There’s also some mixed reports they’ve been reaching out to Ukraine’s neighbors on the down low via unofficially methods And offering Ukrainian territory as well as Security assurances and assistance in securing prospective territory. In exchange for non/limited intervention.