TALLINN: Estonia said on Thursday (May 15) that Moscow had briefly sent a fighter jet into NATO airspace over the Baltic Sea during an attempt to stop a Russian-bound oil tanker thought to be part of a "shadow fleet" defying Western sanctions on Moscow. Russia, which views sanctions as a malign attempt to crush its economy, says its ships have free passage in the Baltic, any attempt to stop them is dangerous and it is ready to respond. NATO alliance member Estonia's military said the unflagged