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The following spring, Nixon ordered a theater-wide offensive, seeking to seize the initiative in the war. South Vietnamese forces crossed into Cambodia and Laos in early February 1971. The North Vietnamese had anticipated the incursion into Laos, known as Lam Son 719, and massed their forces in an attempt to annihilate the South Vietnamese. The South Vietnamese withdrawal disintegrated into a disorderly retreat.

Meanwhile, Nixon and Kissinger sought to reshape the international context of the war through building relationships with North Vietnam’s superpower allies in Moscow and Beijing. Nixon wanted to create a dilemma for the Soviet and Chinese—give them “bigger fish to fry,” in his phrase—in choosing between their support of North Vietnam, and a closer relationship with the United States. The 1972 summits in Beijing and Moscow reflected this strategy, though the Communist powers continued their material support of Hanoi.

The North Vietnamese opened a three-pronged offensive in South Vietnam, known in the United States as the Easter Offensive, in late March 1972, expecting that a victory on the battlefield would translate into a triumph at the negotiating table. Rather than accept the prospect of defeat, Nixon sent massive air force and naval reinforcements to bases in Indochina and Guam. On May 4 he decided to mine North Vietnam’s harbors and open a sustained air offensive, Operation Linebacker, against North Vietnam. These actions, along with intensive air attacks in the battle areas and improved South Vietnamese defenses, stymied North Vietnam’s offensive, leading the Politburo, for the first time, to engage in serious negotiations.