Landgrabe stated that the Warsaw Pact invasion of Czechoslovakia was proof that the Cold War could not be 'thawed'. When the USS "Pueblo" was captured by North Korea in 1968 he supported sending a forty eight hour ultimatum that would threaten nuclear warfare unless all of the Americans were returned. In 1972 the House of Representatives voted to approve the Strategic Arms Limitation Talks treaty between the United States and the Soviet Union that had a "freeze" on offensive missiles for five years. The vote in the House was 329 in favor and 7 against with Landgrebe as one of the seven nays.