If you blame them, then you have to do something about it.
I doubt they are going to find any torpedo or mine parts clearly labeled “Made in North Korea” so without proof, there is not really that much you can do.
Yes, the Norkies are the obvious suspects, but saying that and proving that are two different things.
Sucks, but there it is...
Politics before truth, nothing unusual here. Only 38 sailors are confirmed dead /sarc. I guess the body count is not high enough to justify definitive action.