Deeply focusing on the new materials that are collected from Vietnam, this paper unveils the process of supporting the war efforts in Vietnam by the DPRK Government in the 1960s. It then reexamines the existing literature regarding this issue, while at the same time presenting a more multi-dimensional take on the topic. North Korean assistance for North Vietnam during this war consists of noteworthy features. The DPRK Government provided the largest possible support for Hanoi in the year 1965, dispatching human resources such as air forces and psychological warfare personnel to Vietnam following American bombings of the Northern part of the country. However, North Vietnam tried its best to limit the presence or participation of foreign troops in their country to avoid an internationalization of the war. Hanoi, as a result, emphasized that North Korean air forces were sent to Vietnam to gain “practical combat experience.” On the contrary, Pyongyang strongly insisted that the purpose of dispatching air forces was to support Hanoi, as if it was an “international obligation” in the joint struggle against the Americans. In particular, North Korea in 1965 assisted North Vietnam beyond the original request of up to 4 million Rubles as a proof of its fulfillment of “international obligation.” At the end of the 1960s, nevertheless, Pyongyang drastically reduced its support for Hanoi, signaling a downturn in North Korea-North Vietnam relations.