High Quality Content by WIKIPEDIA articles! The Yakovlev Yak-14 (NATO reporting name: "Mare", Russian: Як-14) was the largest assault glider ever to enter service with the Soviet Air Force. It was introduced in 1949, at a time when other air forces were abandoning the glider concept. In 1950 a Yak-14 became the first glider to fly over the North Pole.