China becomes the definition of chaos, 1970-1971
The majority of China not under foreign control was in a state of anarchy. Most of the nation was under the control of warlords, usually high-ranking officers from the PLA who took control of the land with their troops. The groups of PRC loyalists, ranging from the Red Guard to Army remnants, pillaged the villages and towns of the country. To say China's infrastructure was bad would be an understatement, and many civilians were stuck in this terrible hellscape.
And obviously, there were the international 'expeditions'. While Xinjiang (now East Turkestan) was independent, it was under de-facto occupation by the Soviets. Tibet was the only country that was free of foreign influence. But the intervention of the ROC takes the cake as the largest. The Republic of China (ROC) had survived on Taiwan and never stopped presenting itself as the real, legitimate government of China, claiming the mainland and a whole bunch of other stuff including the entirety of Mongolia, along with parts of India, Bhutan, Pakistan, Afganistan, Myanmar, Tajikstan, and the USSR. Once it looked like the Sino-Soviet war was going to escalate, the Republicans had begun importing large amounts of the latest equipment, like transport and assault helicopters, along with M14 Snipers and M16 Rifles. Chaing Kai-Shek, the leader of the Republic of China, had also ordered a lot of ships and boats from the Americans, including one Tarawa-class amphibious assault ship, and dozens of riverine patrol craft freed up from the end of the Vietnam war. In May of 1970, only three months after millions of Chinese citizens were incinerated in nuclear fire, Operation Reunion was launched.
Ten ROC divisions landed in Guangdong and meeting minimal resistance (most of the anarchy was inland) captured most of it. The Red Cross with help from the American advisors and Taiwanese troops set up a relief network of hospitals and food distribution centers. Getting the Chinese to trust them was a difficult task seeing as they had been constantly denounced in propaganda for over 30 years and the time when they governed the mainland hadn't been extremely successful. Most people realized the People's Republic of China wasn't coming to their aid anytime soon (it didn't help that plenty of people in Red Guard and People's Liberation Army uniforms raped and pillaged their towns and cities), so they eventually began taking the food and medicine that was offered. Soon, recruitment was opened in the Republican Army for mainlanders, most of whom were either grateful for the aid and help and wanted to pay it forward to their fellow Chinese living in horrific conditions in the interior of the country, not to mention the pay was good for someone on the mainland. The troop strength of the ROC's army reached over 1 million within three months of the occupation beginning, as they steadily began liberating the coastline and some of the interior.
The British opened up Hong Kong's port for resupplying Republican forces, and the Americans loaned billions and sent over thousands of additional troops. While some were uneasy about getting involved in another 'foreign escapade' so soon after the Vietnam War, most thought the humanitarian crisis in China counted as a just cause (which resulted in some of the strongest supporters of the intervention being young people and former anti-war protesters. These truly were strange times.
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NOTE: China has so many warlord feifdoms that I just included all of them in the PRC area. Beijing is under control of the central government, while the rest is under control of former PLA officers.