Nuclear mines found aboad Soviet merchant vessel

In the early 80’s I remember reading a book where the story ended up with the discovery of nuclear mines aboard a Soviet merchant ship in a European port (cant remember name of book or author sorry).

What would be the effect of such a discovery?
 
In the early 80’s I remember reading a book where the story ended up with the discovery of nuclear mines aboard a Soviet merchant ship in a European port (cant remember name of book or author sorry). What would be the effect of such a discovery?

It would be (may have been) hushed up, the ship sent back to the USSR and the whole thing classified so deep it will never come to light.
 
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