It was two, the Russians can replace things themselves, Ukraine has to beg donors for more.
Can you spot the difference?
And all ships will be vulnerable going forward, this will not be unique to the Russian fleet, the age of air craft carriers is coming to an end. Drone swarms will over whelm defenses. You can only carry so much ammo. Tanks and APC's look like they are in trouble to. War evolves.
