We all presume the mail delivered to us is ours, and we don't always check. I sometimes get half a dozen letters, and I open them before looking at each individually. If someone sends something to this address in error, that's the price they pay: I could just as easily bin them unread as unsolicited mail. At least what's happened helps move matters forwards.
Opening a letter in error is no crime, and should not be punished as one.

Oh, and Stim, is it really necessary? Yes it is, because you've been exporting your shit here. A Nation can do as it likes as long as it doesn't interfere with its neighbours, but when it does so interfere, then it takes its lumps.