Putin's problem is financing weapon research and development; you can't skim off the top of a falling gross national product, and still pay for expensive arms projects (you could, if you sacrifice your cut, social welfare, and infrastructure).
I think the rumour is they tried to put a nuclear warhead on one of these babies, and the test went awry; I will speculate the Russians have given up on the torpedo variant after the Kursk went down.
They've had to try to get India as a sugar daddy to finance their more conventional arms research and development, and in referring back to their plans to build a catamaran aircraft carrier, you have to recall the odyssey of the Admiral Gorshkov, which probably soured off the Indian government in pouring more money in the Russian military industrial complex, given other options.
They'd have to be pretty desperate to share their research with the Chinese to get funding, having learned their lesson with Germany.