As has already been pointed out, the Kuznetsov isn’t in the very best of mechanical health and is very expensive to maintain. Sections of the ship are missing heating, hence the Russian Navy’s deployments to warmer climes.
The aircraft themselves are adapted from land based designs, with no catapult to hurl them off the deck, they’re reliant upon engine thrust and a ‘ski-jump’ to get them airborne, which hurts range and weapon load.
However, the Russians have exactly one more aircraft carriers than we do (unless we include our Naval alliance with France whereby we share access to the Charles De Gaulle[/i]). Clever Dave scrapped the Ark Royal in 2010, the Kuznetsov-sized Queen Elizabeth and Prince of Wales are at least four and eight years away from their in service dates and have exactly zero planes to fly from their decks. Our new carriers will also have no catapults and rely on ‘ski-jump’ ramps to get their hideously expensive and controversial jets airborne.
Probably best to just let the Russian Navy show off for a while and before waving them farewell once they clear the Channel.