President Volodymyr Zelensky said in an interview broadcast on Sunday that Ukraine had received sophisticated air defence systems from the United States. It was the first acknowledgment that Ukraine had received the National Advanced Surface-to-Air Missile System (NASAMS), long sought by Kyiv and whose shipment was approved by Washington late last month. “We absolutely need the United States to show leadership and give Ukraine the air defence systems. I want to thank President (Joe) Biden for a positive decision that has been already made,” Zelensky said, according to an English-language trans…