Commies have built a fast-attack submarines back to the 1970s using titanium alloy. Just imagine the cost of these being built in a market, not a command economy.
Its not cheap by our standards, but back in the day, when those “Alfa” class SSN’s (IIRC) were built and deployed, it was a fairly good boat for them and the mission it had to conduct...
If the Russians dump those boats on another country, like the NK’s...We might be in trouble because our (Navy’s) mission has shifted a little away from “blue water” ops, to a more Spec Ops support role...
Sure we can quickly adjust, but at what cost to us??? In current materials and personnel???
Just pushing back the envelope back a tad...