Russia begins deliveries of upgraded Su-57M fighters fitted with 101KS sensors
Russia has begun delivering upgraded Su‑57M fifth‑generation fighters to the Aerospace Forces, equipped with a modernized 101KS optical‑electronic self‑defense/tracking system, revised onboard systems and an enhanced weapons suite. Satellite imagery shows at least 15 Su‑57s concentrated at Dzyomgi air base in Khabarovsk, ~280 km from the Chinese border.