Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Trump Veto of F-35s for Turkey Could Force Ankara to Buy Russian Aircraft Dorian Jones ISTANBUL - U.S. President Donald Trump's decision to block the sale of the advanced F-35 jet to Turkey means Ankara may look elsewhere to replace its aging air force. Trump's veto in response to Turkey's acquisition of Russian missiles could prompt Ankara to turn to Moscow again. Trump's announcement followed the first deliveries of Russia's S-400 air defense missile system to Turkey. Washington had repeatedly warned Ankara that the S-400's advanced radar could compromise the F-35 stealth technology, making delivery of the jet impossible. However, Trump's decision appears to have taken Turkish President Recep Tayyip Erdogan by surprise. .