Three Russian military jets on Friday violated NATO member Estonia's airspace for 12 minutes in an "unprecedentedly brazen" incursion, its government said, the latest in a series of recent military actions by Russia that have rattled the alliance. The incursion came just over a week after more than 20 Russian drones entered Polish airspace on the night of Sept. 9-10, prompting NATO jets to down some of them and Western officials to say Russia was testing the alliance's readiness and resolve.