Even assuming all of these nations record the real-time location of every fishing boat, dinghy, yacht and tug-boat; and can play it back and analyze all of the data; and thereby backtrack to port of entry; and then crew; and then investigate all of the false positives within days. Implausible, but ok, assuming.
But they can find no one, or all the trails run cold. Your next go-to idea for the failure would be Russia or the US?
Come on. Aren't there other plausible reasons?
