Analysis of information sources in references of the Wikipedia article "Easter Offensive" in English language version.
Shortly after Podgorny's departure, a high-level Soviet military mission arrived in Hanoi to stay until March 1972. Much of this Soviet activity was in preparation for the large-scale assault by North Vietnam's army across the 17th parallel in March 1972.
Operation "Bullet Shot" conducted during 1972 and resulted in the North Vietnamese finally getting serious about negotiating.
Shortly after Podgorny's departure, a high-level Soviet military mission arrived in Hanoi to stay until March 1972. Much of this Soviet activity was in preparation for the large-scale assault by North Vietnam's army across the 17th parallel in March 1972.