D'Orlandi was able to arrange for Lewandowski to meet Henry Cabot Lodge Jr, the U.S. ambassador in Saigon, and the talks went well. By November 1966, it was arranged that John Gronouski, the American ambassador in Warsaw, would meet with North Vietnamese diplomats the next month for peace talks in what was code-named Operation Marigold. By December 1966, American aircraft bombed oil facilities and railroad yards in Hanoi, which led the Poles to warn if the U.S. continued to bomb Hanoi, the talks would be aborted. Rostow told the president that he believed that Operation Marigold was a "trap" and the North Vietnamese demand that Hanoi not be bombed anymore showed the bombing campaign was indeed working as he promised it would. On December 6, 1966 Johnson refused Harriman's request to cease bombing Hanoi and a week later, the planned talks in Warsaw were cancelled as the North Vietnamese announced that there would be no peace talks as long as North Vietnam was being bombed. In January 1967, Rostow reported to Johnson that the Viet Cong were "disintegrating" under the American pressure, writing optimistically that the major problem for the Americans in the coming year would be to find the best way to integrate those Viet Cong guerrillas who had surrendered back into civilian life. In a further hopeful sign he reported to the president in the same month that the bloody chaos of the Cultural Revolution had pushed China to the brink of civil war as "Mao's own prestige has been seriously, perhaps irretrievably, tarnished in this yet unavailing fracas". With China collapsing into chaos, he believed that the Chinese would be limited in their ability to support North Vietnam for some time to come. In fact, Mao continued to support North Vietnam during the war with the war serving as a foreign policy counterpart to the Cultural Revolution as the "Great Helmsman" believed that extreme violence was necessary to maintain Communist "purity". The fact that some of Mao's targets in the Cultural Revolution such as Liu Shaoqi and Deng Xiaoping were opposed to increased aid to North Vietnam, preferring that the money be spent on Chinese development instead, gave him an additional reason to support North Vietnam.