A Game of Thrones
Perhaps no region saw its politics dominated by the diverging political interests of monarchical figures than a somewhat war-torn region of the world, French Indochina. Despite being Europe's leading republican state, the French colonial empire more or less ruled through all of its Southeast Asian dominions indirectly through monarchs in Vietnam, Cambodia, and Laos. As the French Empire receded from Asia rather rapidly during the Three Years War and the Algerian War, all three monarchies had somehow survived. During the Three Years War, the French grudgingly had earlier agreed to the return of the relatively popular Duy Tan to Vietnam, giving the unpopular Central Government of Vietnam a huge boost in popular legitimacy. The French Empire seemed like it would ensure in Southeast Asia - until a few royals made their moves.
By 1954, the left-wing United Issarak Front led by Son Ngoc Minh controlled essentially two-fifths of the country. With French troops busy in Vietnam at first and then scaling down their troop presence in the region, French colonial authorities in Cambodia grew increasingly worried. Although Cambodia had officially declared independence in 1953, French officials were still very influential on the ground, causing great worry about the UIF threat. King Sihanouk (who was ironically placed onto the throne by the French, who thought him a pliable puppet), increasingly fearing that the Communist insurgency would triumph, decided to completely go over the heads of his French masters, negotiating directly with UIF leaders, in particular Tou Samouth. Although the Viet Minh preferred to treat Sihanouk kindly in hopes that he would be a neutralist leader, the Cambodian Communists were willing to bargain more harshly, given the failure of the Viet Minh to really seize much territory outside of the mountains of Vietnam. Sihanouk eventually pulled out of negotiations with the UIF, after the UIF demanded that the Communist Party of Kampuchea be allowed to compete in fully fair elections. Although Sihanouk agreed in principle - he was unable to provide any assurances that this would happen. As Communist forces continued to advance in the countryside, Prince Norodom Phurissara, a cousin of Sihanouk, maneuvered his way into the position of Prime Minister, as many in the ruling Democratic Party thought that the left-leaning Phurissara would be better negotiate with the Communists. Going over the head of the King, Phurissara covertly bargained with the UIF, essentially agreeing to their demands for a fair and free election.
Sihanouk surprisingly did not respond with rage, given that he actually liked his cousin and knew him from a young age, despite their political differences. Agreeing to disagree, Sihanouk accepted the peace deal, which also required that the Cambodians withdraw from the French Union. Indeed, almost immediately after the Soviet invasion of Finland, forcing a further diversion of French troops, King Sihanouk declared that Cambodia would be leaving the French Union, outraging both the French and the Americans, who were seemingly powerless to stop him. A pragmatist, Sihanouk moved forward with an alliance with his cousin Phurissara, whereupon Phurissara would support his internal agenda of "Buddhist socialism" - which included constitutional monarchy, women's suffrage, public education, land reform (but no collective farming), and large public works. Phurissara's Democratic Party defeated both the right-wing Khmer Renovation Party and the left-wing Communist Party in the 1956 elections, keeping the Communists out of government despite having friendly relationships.
With little money to build his infrastructure programs, Sihanouk went on an international tour looking for aid. He was happily received by President Chiang Kai-Shek of the Republic of China, but a week after returning in triumph, the KMT reneged on all of its promises, much to his fury and consternation. He applied to the French, British, Americans, and whoever he could find, but was repeatedly turned down. He quickly began to realize that under French insistence (with support from President Russell), the Western powers were essentially treating his regime as persona non grata. The KMT was not opposed to Sihanouk in any sense, though they actually relented because of anger not from France, but from Thailand, a key partner that saw Sihanouk as inculcating Communism. One country seemed particularly kind to Sihanouk however - Communist Burma and to a lesser extent, their friends in North China. He quickly struck up a close relationship with Zhou Enlai (who had come with Mao to Burma but stayed behind), the head of the Chinese military mission in Burma (officially known as the Yunnanese People's Liberation Front), which was largely stuck in Burma because they had no actual way to get back to North China. The YPLF quickly became an indispensable ally of the Burmese government, because Zhou Enlai was a clever diplomat who tried to stay neutral in any Burmese power affairs. YPLF troops quickly grew to monopolize the opium trade in the Golden Triangle, sharing such revenues with the Communist Burmese, making them ironically a de facto power of their own, linking North China and Burma together. The YPLF was also instrumental to the Communist Burmese defeating the Nationalist Burmese remnants in North Burma, especially as many ethnic minority groups preferred YPLF influence to Burmese control (due to perceived ethnocentrism of a Bamar-dominated central Burmese government). The slow fall of the Nationalist Burmese remnants in North Burma left the Nationalist Burmese with only a tiny sliver of land in the Tanintharyi Region (defended by the Royal Thai government). Tanintharyi used to be controlled by Thailand centuries ago, leaving many to believe that the Thais were slowly integrating Nationalist Burma into their nation.
With Burmese and North Chinese support (Burmese funding, North Chinese engineers), Sihanouk returned triumphant from Rangoon, sparking alarms in the heads of Western governments. By 1957, the new McCarthy administration in the United States had seen enough. To the Central Intelligence Agency, Cambodia seemed to be openly aligning with the Communist Bloc. Dap Chhuon, a right-wing warlord in Cambodia, joined with Cambodian intellectual Son Ngoc Thanh and his Khmer Serei militia, closely supported by French-aligned militias and mercenaries from the Republic of Cochinchina (as well as ethnic Cambodians from Cochinchina, of which there are many). The King of Thailand (and his right-wing Prime Minister, Sarit Thanarat) signed off, as did French President de Gaulle and even Chinese President Chiang. Notably, the King of Laos refused.
Shortly after Dap Chhuon started a rebellion in Northwest Cambodia to distract Royal Cambodian forces, the Khmer Serei invaded from Cochinchina with French support. The effect was immediate. Royal Cambodian forces were caught totally off-guard, causing prominent politician Lon Nol to defect at a critical moment. Fleeing for their lives, Phurissara and Sihanouk fled the capital as coup forces approached. Phurissara was able to get out in time, but Sihanouk's plane was intercepted at the airport. The King was placed under house arrest, but the Communist Party of Cambodia, as well as left-leaning politicians aligned with the ruling Democrat Party, formed the Royal Government of the National Union of Kampuchea (GRUNK), based on Rangoon, which sponsored a Communist insurgency in Cambodia itself. Son Ngoc Thanh, a former member of the UIF (with some nationalist credentials) who opposed the Communist majority was declared the new President of the Khmer Republic, which immediately faced what was rapidly spilling into a civil war. Arguably, it was widely believed that the Khmer Republic would have collapsed in 1957 if not for the end of the Three Years War, which allowed French forces to quickly return to Cambodia, which rejoined the French Union. Even as the peasantry widely sided with the Khmer Rouge (as right-wing peasants revered the monarchy and left-wing peasants just became Communists), the regime managed to hold on in the critical year of 1957.
The result of the Cambodian coup was to spark panic across the border in the Kingdom of Laos, where Prince Souvanna Phouma and Prince Souphanouvong had agreed on a stable coalition government to keep Laos neutral in the increasingly bloody proxy wars between the capitalist and communist worlds. Souphanouvong's sympathy was with the Communist world, but with the Viet Minh largely not seizing control of Vietnam as planned, he saw neutralism as a benefit to the Viet Minh. Under the neutralist policy of the Laotian government, the Royal Lao Army would neither help nor hinder Viet Minh forces operating on the Vietnam-Laos border, which in practice was a huge boon for the Viet Minh (temporary sanctuary was very important for them), because the Laotians would object to Royal Vietnamese military offensives into Laotian territory. The King of Laos, Savang Vatthana, simply wanted peace and attempted to get all political factions in Laos to cooperate. However, with Burmese supply trains going through Laotian territory to support both the Khmer Rouge and the Viet Minh, international attention slowly began to fall on Laos, and in particular, the right-wing prince Boun Oum, who was known to dislike the ruling neutralist government...