Russia has completed the delivery of Su-35 combat aircraft to China in defiance of U.S. sanctions, Russia’s military and technical cooperation agency told state media Tuesday.

Russia and China signed a $2.5 billion deal on the delivery of 24 Sukhoi Su-35s in 2015, making it the first foreign buyer of the fourth-generation multirole air superiority fighter. The United States imposed sanctions on the Chinese military last September for buying 10 Su-35s in 2017 and missile systems in 2018 from Russia.

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