It will end up in the need to destroy Russian saboteur boats on sight. Putin is a moron if he thinks piracy methods will help him.
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But damage to communications is a tangible thing, so if this is going to get worse, Putin's boats will be just sunk in such areas as a preventive measure. And Putin will do nada about it despite all this threats, except may be looking for other places to cut cables and engage in similar trash behavior until he is chased out of there too.
Sinking of his ships is something he very quickly understands, since he practically can't make new ones.