 During the 2009 MAKS air show , the Russian Defence Ministry signed a US $ 2 @.@ 5 billion contract for 64 fighters , which consisted of a 48 @-@ aircraft launch order for the Su @-@ 35S ( " Serial " ) . The Russian government promised to provide Sukhoi an additional US $ 100 million in capital , with additional financial assistance from <unk> and <unk> , the latter of which was contracted to provide US $ 109 million to start the production programme . The Su @-@ 35S 's estimated price was $ 40 million each , and the 64 @-@ aircraft contract was the largest aircraft order after the collapse of the Soviet Union . All are expected to be delivered by 2015 . 
