I'm of the understanding that Russia can't build them quick enough for their own ships let alone taking big foreign orders.
Money talks... right now Russian engine companies are scrambling to make new engines they didn't have to make before because the Russian Navy traditionally ordered them from the Ukraine.
Building up production capacity takes time and money, but obviously getting orders for engines for the Russian navy is something solid that most banks will give loans for to build and expand factories and order and buy materials and machines to build the engines.
However get a large order from China for maybe three or four times more engines and you can build new factories to make these engines in serial production facilities so you can get bigger loan guarantees and increase production levels and speed to make more faster, which is good for the Russian Navy and the Chinese Navy, but not so good for Motor Sich which might not be able to expand production in that way... because these Chinese orders are likely all they have with no domestic engines needed and certainly no orders from the Russian navy either.