Schlesinger devoted much attention to the North Atlantic Treaty Organisation, citing the need to strengthen its conventional capabilities. He rejected the old assumption that NATO did not need a direct counter to Warsaw Pact conventional forces because it could rely on tactical and strategic nuclear weapons, noting that the approximate nuclear parity between the United States and the Soviets in the 1970s made this stand inappropriate. He rejected the argument that NATO could not afford a conventional counterweight to Warsaw Pact forces. In his discussions with NATO leaders, Schlesinger promoted the concept of burden-sharing, stressing the troubles that the United States faced in the mid-1970s because of an unfavorable balance of international payments. He urged qualitative improvements in NATO forces, including equipment standardization, and an increase in defense spending by NATO governments of up to five percent of their gross national product.