This was an old Wikipedia hoax I came across in 2005. I mistook it (and the corresponding Vientiane Treaty) as real, and mentioned it in my Why never a three-sided Cold War? thread: https://en.wikipedia.org/w/index.php?title=Eastern_Pact&oldid=573928725
Sadly the editors caught on at the end of May and deleted both articles.
So, what if the PRC tried to make its own Warsaw Pact? First off, I doubt Vietnam or North Korea would be very eager to jump on- the former because of age-old animosity towards China, and didn't the Kims always try to play Moscow off against Beijing? And wasn't also Mongolia more in the Soviet sphere than the Chinese one? Funnily enough, Albania might've been interested in this after the Albanian-Soviet Split, up until it split with China. (Were they like North Korea of Europe, or what? Just remarkable.)
Anyway, I'm sure there are other Wiki hoaxes that might make for fun althist: https://en.wikipedia.org/wiki/Wikipedia:List_of_hoaxes_on_Wikipedia
The Eastern pact was a military alliance established in 1980 and dissolved five years later.
History
Creation of the Eastern Pact
The need for the alliance was a result of the Cold War. The People's Republic of China, a powerful communist state, had experienced a worsening of relations with the Soviet Union. The difference arose from the USSR's desire for a unified communist bloc under its control, while China held its own ambitions. By the 1970s through the 1980s Sino-Soviet relations had reached their worst point. Wanting to secure its place as leader of the Asian communist nations (which it had kept by supporting North Korea and North Vietnam during the Korean war and Vietnam war), China initiated the establishment of third alliance, the Eastern Pact, which would be set against both Soviet and American interests in Asia, and probably would have sought influence over other Asian countries as well, in a similar fashion to NATO and the Warsaw Pact. The alliance was founded on July 4, 1980 by the People's Republic of China, North Korea, Vietnam and Cambodia (nominally under Vietnamese control at the time). The laws of the fledgling alliance stated that the number of votes allotted to each member was apportioned according to their respective GNP, which firmly secured Chinese control. Both the Vietnamese and North Korean government, however, saw the alliance as a possible safety against the United States, or other western powers who might stage an invasion.
Expansion and collapse (1981-1985)
On January 13th 1981, Mongolia was accepted as the fifth member of alliance when the foreign ministers of all five countries signed an agreement of expansion in Beijing. This led to Soviet protests however, because Mongolia shared a long border with the Soviet Union, and had the effect of further damaging Sino-Soviet relations. In February of 1981, the alliance was reformed, its permanent headquarters was opened in Shanghai, where each of the member countries sent a delegation. China continued to work to attract more countries to join the alliance. In April of 1981, Laos joined the Eastern Pact, unofficially in exchange for major Chinese aid. China also aggressively pursued the expansion of the Eastern Pact outside of Asia, becoming a major partner for various socialist "third world" governments and attempting to create a third respectable player in the cold war. The only success of this policy was admission of Angola to alliance in 1982; other attempts proved to be failures (primarily because the unwillingness of third world countries to depend exclusively Chinese aid, as they perceived the Soviet Union to be more reliable), although some countries received associated status. The alliance's expansion stopped after early 1982, when negotiations with Yugoslavia met with no results. With the relaxation of tensions with the Soviet Union, the need for the alliance was lost. The Eastern Pact was officially dissolved in September of 1985. It was replaced by the short-lived Vientiane treaty, which included the Southeast Asian nations of Laos, Cambodia and Vietnam, but this treaty quickly proved unworkable and was dissolved.
Structure
Each country's votes were apportioned by its GNP (not GNP per capita), therefore China's vote was grossly overwhelming. Each country had to defend any other country of the Eastern Pact in case of war. The headquarters were established in Shanghai in 1981, and each member state sent an ambassador to the Eastern Pact there (the Vietnamese ambassador also supposedly represented Cambodian interests, due to the Vietnamese occupation of Cambodia at the time after the overthrow of the Khmer Rouge). Sessions of the Eastern Pact were held four times a year, and could also be called at any time if countries constituting 25% of Eastern pact GNP called for a session. An emergency session would also be called in the case of a declaration of war by or against any of the member states, however the alliance was only defensive. This was agreed on as a means for China and other countries to prevent North Korean aggression against South Korea.
Members
Sadly the editors caught on at the end of May and deleted both articles.
So, what if the PRC tried to make its own Warsaw Pact? First off, I doubt Vietnam or North Korea would be very eager to jump on- the former because of age-old animosity towards China, and didn't the Kims always try to play Moscow off against Beijing? And wasn't also Mongolia more in the Soviet sphere than the Chinese one? Funnily enough, Albania might've been interested in this after the Albanian-Soviet Split, up until it split with China. (Were they like North Korea of Europe, or what? Just remarkable.)
Anyway, I'm sure there are other Wiki hoaxes that might make for fun althist: https://en.wikipedia.org/wiki/Wikipedia:List_of_hoaxes_on_Wikipedia