 Following preliminary tests , the Defence Ministry was expected to initiate state joint tests involving six Su @-@ 35s to further scrutinize systems such as weapons . In early 2012 , two aircraft were reportedly planned for delivery in 2011 , eight in 2012 , twelve in 2013 and 2014 , and fourteen in 2015 . In February 2014 , the Russian Air Force received 12 Su @-@ 35S aircraft . By 2014 , 34 of the 48 aircraft originally ordered had been delivered with the remaining 14 due in 2015 . 
