Ukraine supplied of SU-27 components to the USA in 2017
According to the importgenius.com resource in 2017, Ukrainian exporters supplied to the US part of the components to the Su-27 fighter.
March 2017 Technological cards for testing the engine AL-31F. The recipient is located at Hill Air Base, Utah.
October 2017 – 4 power units BP-58-01 for Su-27.
Units and blocks of the engine AL-31F. The recipient is located at Hill Air Base, Utah.
November 2017 – 2 launching device APU-470, which is designed to launch missiles R-27; 2 the launching device P-72-1DB2, which is set to launch missiles R-73. The recipient is located at Hill Air Base, Utah.
In addition, in 2016, components of the on-board radio-location station H001 for the Su-27 were sent to Hill Air Base.
It should be noted that in November 2016, an American photographer was shooting an air combat between the F-16 and the Su-27 in Nevada. Probably the specified components were intended for Su-27, which is used in the USA and which was spotted in Area 51.