A pair of US Air Force F-16C Fighting Falcons. Stocktrek Images/Getty Images Ukraine’s pilots are now learning to fly Western F-16 fighter jets. Ukraine has sought F-16s since the early days of Russia’s invasion. Ukraine’s Soviet-era MiG-31 and Su-27 are outmatched by newer Russian jets. Ukraine President Volodymyr Zelenskyy has long said the country’s long-term security hinges on its ability to compete with Russian air power….