The Russian jet fighters were in Estonian airspace for 12 minutes and left after the North Atlantic Treaty Organization aircraft responded, said Estonian Prime Minister Kristen Michal. It marked the second time in two weeks that a NATO member invoked Article 4 of the alliance’s treaty, triggering formal discussions.NATO jet fighters intercepted Russian war planes that violated Estonia’s airspace Friday, causing the tiny Baltic state to call for formal consultations with members of the Western alliance. Is Russia testing the waters ?
