But I still do not see who Russia is supposed to use air craft carriers against. It does not have colonies and it is not looking for any.
Russia needs carriers because aircraft are the best way to find and stop threats to surface ships and submarines.
Russian aircraft carriers will not be used to invade countries like US carriers do, or British or French carriers do... they are to protect Russian and allied surface ships in international waters going about their business.
Zircon makes aircraft carriers obsolete like ATGMs make tanks obsolete and MANPADS makes aircraft obsolete.... ie they don't.
Zircon will be a very potent weapon, but nothing is perfect.
The best air defence includes aircraft as part of that air defence... the best air defence for the navy has fixed wing carriers and long range fighters.
Having VSTOL aircraft at sea is like having helicopters on land defending airspace...
No Smaller carriers would go the same speed, smaller the carrier smaller it's propulsion, which makes it slower. Bigger carriers have MUCH bigger propulsions, A smaller carrier could turn faster sure but go faster in a straight line? nope.
Carriers can go as fast as you want to make them... it is power to weight ratio... a very big carrier would need a huge power plant to go very fast... smaller vessels need less power to go the same speed.
You need alot more then two to make them harder to sink if your plan is "Make so many the enemy has to distribute their Anti-ship weapons more across the globe to counter all the carriers"
How hard a carrier is to sink is determined by the quality and performance of its escorts and its own aircraft... any defence can be overwhelmed with numbers but then numbers matter in defence too so more carriers and more escort ships will stop more powerful attacks.
Russia can reduce the strength of the attacks by pre-empting any attack with a few nuclear armed Zircons sinking enemy platforms before they launch strikes on Russian surface vessels.
An attack of 1,000 Harpoons might be successful, but shooting down or destroying the aircraft or ships carrying those Harpoons before they launch make the job of defending easier, so long range AWACS and fast fighters can intercept and start to blunt a massive attack earlier and more effectively than waiting with no aircraft at all when the first missiles start coming over the horizon.