MOSCOW, April 05 /ITAR-TASS/. The Russian Knights aerobatic team marks its 23rd anniversary. The group, the world's only one piloting heavy fighters, Sukhoi-27s, was formed on April 5, 1991. In the early 2000s, the Russian Knights and the Swifts began to fly in the formation called "Kubinka Diamond" of five Su-27 and four MiG-29 jets. The two aerobatic teams almost every day train at their base at Kubinka near Moscow, mastering their piloting skills in the air. Before joining the group, a pilot must undergo two-three-year training. Each of the newcomers is an ace who has logged at least 800...