US President Joe Biden has ruled out sending F-16 fighter jets to Ukraine, despite renewed calls from Ukrainian officials for air support.Asked by a reporter on Monday if the US would be providing the planes, Mr Biden replied simply "no".His comment comes a day after Germany's leader also ruled out sending fighter jets.Ukraine has said it needs the jets to take control of its airspace in its ongoing war with Russia.F-16 Fighting Falcons are widely considered one of the world's most reliable fighter jets and are used by other countries, such as Belgium and Pakistan.They would be a significant upgrade...