Not many Lee, but if you want access to one, about all you need, if the thing is available, is money in your hands. Should be interesting to see how this all plays out. With RMSTI giving up salvage rights, once the court with jurisdiction signs off on it, the ship legally becomes fair game for anyone with the resources to have a go at it.
Even if the four nations mentioned in the article sign that treaty outlawing salvage, it wouldn't have any force with a nation not a signatory to the treaty. Basically, if Russia was to go for it, they could tell the Four signers to go get stuffed and there wouldn't be much they could do about it.
It's not as if anyone is going to send a warship to protect a wreck.