Sukhoi Su-33 related to T-10K. Negotiations stagnated as the Shenyang Aircraft company sought to reduce Russian content in the aircraft, while Sukhoi wanted to ensure a level of income from future upgrades and modifications made to the J-11. India was also viewed as another potential operator of the Su-33. The Indian Navy planned to acquire the Su-33 for its aircraft carrier, , the refurbished Soviet , which was sold to India in 2004. In the end, the rival MiG-29K was opted for, because of the Su-33's outdated avionics. The size of the Su-33 reportedly led to concerns over potential difficulties in operating
Sukhoi Su-27 by the Japan Ministry of Defense. Russia denied the incursion, saying the jets were making routine flights near the disputed Kuril Islands. In another encounter, on 23 April 2014 an Su-27 nearly collided with a United States Air Force Boeing RC-135U over the Sea of Okhotsk. Russia plans to replace the Su-27 and the Mikoyan MiG-29 eventually with the Sukhoi Su-57 stealth fifth-generation multi-role twin-engine fighter. A squadron of Su-27SM3s was deployed to Syria in November 2015 as part of the Russian military intervention in the Syrian Civil War. Ethiopian Su-27s reportedly shot down two Eritrean MiG-29s and damaged another