Before Ukrainian pilots learn to fly the F-16, they receive early-stage training in the UK. AP Photo/Efrem Lukatsky Business Insider visited a Royal Air Force base where Ukrainian pilots receive early-stage flight training. The course sharpens the pilots' flying skills before they move on to more advanced F-16 training. Among the RAF instructors' tasks is helping the Ukrainians shift from Soviet to Western thinking. In front of a British Royal Air Force hangar, Business Insider watched as a tight formation of Grob Tutor training aircraft flew overhead, the whir of their propellers growing louder as they passed. The small, two-seat plane is a modest beginning for the Ukrainian pilots on track to fly one of the most sought-after fighter jets in the world: the American-made F-16.…