By Idrees Ali, Mike Stone and Jan Lopatka WASHINGTON (Reuters) -The United States on Friday announced an additional $400 million in military aid to Ukraine, including refurbishing T-72 tanks and missiles for HAWK air defense systems for Kyiv. Pentagon spokeswoman Sabrina Singh told reporters that the U.S. would pay for 45 T-72 tanks from the Czech Republic to be refurbished and fund refurbishing some missiles for HAWK air defense systems. Singh said in addition to the funds to refurbish the HAWK missiles, the pledged $400 Ukraine Security Assistance Initiative (USAI) funds would refurbish the …