India, Sept. 19 -- Three Russian fighter aircraft entered the Estonian airspace without permission on Friday and stayed there for 12 minutes, in yet another NATO incursion.

The incident prompted the Estonian foreign ministry to summon a Russian diplomat to lodge a protest. This comes after Russian drones violated both Polish and Romanian airspace earlier this month.

Foreign Minister Margus Tsakhna said that Russia had already violated Estonian airspace four times this year, "but today's incursion, involving three fighter aircraft entering our airspace, is unprecedentedly brazen."

His ministry said that the incursion took place over the Gulf of Finland and three Russian MIG-31 fighters were involved. Tsakhna called for increased politic...