Kyiv wants the United States to train more Ukrainian pilots on F-16 fighter jets, but the U.S. says there are limited spots and too many customers from other nations, Politico reported on June 5, citing Ukrainian and U.S. officials. Several countries, including the U.S., have pledged to assist Ukrainian aviators with the necessary training under the F-16 coalition framework. The first Ukrainian pilots began their training at Morris Air National Guard Base in Tucson, Arizona, last October. Ukraine says it has 30 pilots prepared to start the training program in Tucson, but U.S. President Joe Bid…