US President Joe Biden on Tuesday announced the delivery of more air defence systems to Ukraine at a ceremony in Washington to mark the 75th anniversary of the NATO defence alliance. “I’m announcing the historic donation of air defence equipment for Ukraine,” Biden said in a speech to gathered leaders and officials. An accompanying statement by Biden and several other leaders of NATO countries spoke of “dozens of tactical air defence systems” to be delivered “in the coming months.” Ukrainian President Volodymyr Zelensky, who is attending the summit, has repeatedly called for international alli…