I don't think new conventional propulsion units would be needed. Just those already planned for Lavina and Gorshkov-M.
They were probably Ukrainian...
They have about 12 cruisers planned that will use NPP, so I really don't understand why you think their future carriers wont have NPP.
Anything above about 15K tons means nuke propulsion makes sense... especially as that means high speed to get to locations around the world fast without having to plan refuelling stops... especially when Russian ships can be banned from EU and western friendly ports...
The talk about STOVL aircraft makes me think that the aircraft carrier concept the navy is playing around with is definitely under 40000 tonnes.
The Yak-141 was supposed to operate from the Kuznetsov and later carriers were going to be bigger.
While it could have nuclear propulsion, what I think it is more likely, if such concept is approved, is that the ship would be a Lavina variant of
20 something thousand tonnes, with a similar propulsion unit to the LHD.
You are confusing their fixed wing carrier requirements with their helicopter carrier requirements.
they wont have VSTOL aircraft on their Mistral replacements... it simply does not make sense to take helos off a helicopter carrier to fit it with short range slow fighter aircraft, when any time Russia would actually use a helicopter carrier it would also have a fixed wing carrier present too with real carrier aircraft on board.
As for the other possible user of these new nuclear power plants, the Leader destroyer, we already hear that the Gorshkov-M is leading
to a rethink of the prospective destroyer project, so who knows what's going to happen there, or if there will be a new destroyer at all.
the original Gorshkov is a frigate. An expanded version has been called a destroyer.
whether they expand the Gorshkov into a destroyer or not they will still need destroyers and cruisers.
The modular nature of the weapons and sensors means new Russian ships are going to start looking alike... the whole purpose of modular design is the bigger ships have more modules... corvette has 1 or two UKSK launchers so Frigate needs two or three, Destroyer needs 4-6, cruiser 10+.
Same with Air defence missiles and other equipment... the bigger vessel has more of the same or a larger model.
Maybe in the end the new nuclear power plants will be just for the icebreaker fleet.
They spent a lot developing NPPs... it is pretty unlikely they wont fit them to large carriers.
AFAIK there are no models of cruisers with conventional power plants and no actual engine designs currently available to use... the only Kirov sized vessels they have are the Kirovs and the Kuznetsovs and the conventional propulsion components of both vessels were Ukrainian AFAIK...
Do you think it makes sense to say to Saturn... hey now that you have spent a small fortune expanding your operations to make conventional engines for frigates, could you now do the same for destroyers, cruisers, and a couple of carriers...
Again, let me state that this is just my opinion and my current assessment, which could very well be wrong.
Indeed and I could just as easily be wrong.
I doubt very much anything is even set in stone right now so even current plans can change... what ever they are.
But I don't think they would pay the South Koreans enormous amounts of money to upgrade their ship building capabilities in the far east and a small fortune to develop NPP for large vessels to make sub 40K ton carriers with conventional propulsion. It is like building a five car garage for a motor bike... a motor bike with a 5hp motor and pedals.
What the Russian Navy has to ponder is what costs more: developing a large carrier (40000 tonnes and above) and associated infrastructure (if needed)
plus a naval version of PAK-FA (or LMFS), or developing small carrier and a STOVL aircraft.
It is not about cost.
Having no navy at all it by far the cheapest option of all, but it does not suit the future plans of Russia.
A small carrier will still need a carrier battlegroup to operate with it... in fact it will need it more and all the infrastructure to support a large carrier is not that much more expensive than the infrastructure to support a smaller carrier. A smaller carrier just carries less aircraft with shorter ranged slower aircraft and also lacks airborne early warning and control performance.
A larger vessel costs more but actually does the job better.
Just look at the UK... they thought a VSTOL fighter and small carrier would do... they went from Phantoms and Buccaneers on the Ark Royal, to Harriers on the Hermes. What are they looking at now? VSTOL carriers or fixed wing carriers?
the British actually use their carriers more like the Russians do even though they look rather different... Russian and British carriers are first and foremost air defence carriers to defend groups of ships.
US carriers are an attack weapon of strike aircraft with a group of ships to protect it.
So the design philosophy of Russian aircraft carrier designer is completely different from their US counterparts, isn't it? For example, US aircraft carriers are considerably larger
US carriers are about force projection... ie strike aircraft with fighters to support strike missions. The ships in the battlegroup are there to protect the carrier... ie AEGIS class vessels.
Russian carriers are to defend the ships. They are currently looking at giving their aircraft better ground attack performance, but primarily they are fighter interceptors to protect the ships the carrier operates with... if a ground target needs to be attack the ships will use their long range cruise missiles to strike ground targets at extended range at no risk to pilots.