NATO foreign ministers, concluding a two-day meeting in Brussels, said on Friday they hoped Soviet arms cuts would herald a new approach by the Soviet Union to the way it runs its military machine. In a closing communique, the 16 ministers said Soviet leader Mikhail Gorbachev's speech to the United Nations on Wednesday showed how much Soviet policies had changed. Gorbachev announced unilateral cuts of 500,000 men in Soviet armed forces and withdrawals of tanks, guns and planes from Eastern Europe. "In the defense area we express the hope that President Gorbachev's address also represents the starting point of a new approach by the Soviet Union to the size and structure of their military forces and programs," the communique said.