If you recall, the original stealth design was developed in secret for decades. Then, the government still denied the existence of production stealth aircraft (f-117) for nearly 10 years once chatter was “leaked”.
The F-117 was only revealed during the collapse of the USSR, when it was foolishly believed the US would have no more real enemies.
I'm not saying they have Tsunami weapons. But the reality of black projects is often beyond fiction and the Russians are not as stupid with information as we often seem to be.
This is incorrect. All "black" projects become public eventually. You don't know what is "black" now because it is still secret.
The USSR, now Russia, have never been known for high quality munitions. They had effective technology as long as they didn't care about the user dying. If they had the same concern about their personnel that we did, we would have been first in space.