It is reported in three Soviet newspapers that North Vietnamese pilots are undergoing training in a secret Soviet air base to fly supersonic interceptors against U.S. aircraft. This only confirms earlier reports that the Soviets had initiated close relations with North Vietnam after a visit by Soviet Premier Aleksei Kosygin to Hanoi in February 1965 during which he signed economic and military treaties with the North, pledging full support for their war effort. The Soviets and North Vietnamese leadership planned military strategy and discussed North Vietnam’s needs to prosecute such a strategy. The Soviets agreed to supply the necessary war materials, to include air defense weapons for the North and offensive weapons to be employed in the South. At one point in the war, the Soviets would supply 80 percent of all supplies reaching North Vietnam.