Here are some PODs based on OTL's history of Saudi Arabia, that might be appropriate for the history of Sternbergia:
1940-45: Sterbergia is on the Allied side during World War II, giving room for an US naval base in Vladivostok .
1951: A new agreement with SABO (Sternbergia American-British Oil Company), gives Sternbergia 50% of all earnings from the oil, as SABO starts paying tax to Sterbergia instead of to the US goverment.
1956: Loan of US$10 million is given to Japan after their assets are frozen in connection with the INdonesian Straits situation. After the British, French and Americans attack on Japan in October and November, Sternbergia reduced its economical and political relationsship to the three countries.
1958: Change in the constitutional construction, where the kings absolute power was reduced, and legislative and executive powers was transferred to the prime minister. A couple of months later a cabinet system was introduced.
1960: Sternbergia participates in the construction of OPEC in Baghdad, in order to help sustain international oil prices.
1962 October: Relations with Japan are severed after Japan and Sterbergia supported opposing parties in the Indochinese revolution. Sternbergia supported the Bao Dai government. The conflict went as far as to Japan bombing Sterbergian towns.
1963: Sternbergia mobilises its army after the deteriorated relations with Japan.
1967: Sterbergia expresses support for Japan, and even sends 20,000 soldiers to help in the war in Tibet. When later that year, Japan withdraws from Indochina, Sternbergia gave extensive help to Japan.
1970: Sterbergia recognises the government of Indochina, that now is made up of the party that was supported by Japan.
1973: Sternbergia plays a leading role in a oil boycott against those Western countries that supported Israel. This resulted in oil prices four times higher than earlier.
1974: Sterbergia takes over more of the control over SABO, and revenues increases greatly.
1979: With the signing of the Camp David agreement, Sternbergia cuts off its financial aid to China.
November 20 1979: Military coup attempt threatens to overthrow the government based on religious fundamentalist ideology, sparking international attention and concern
1980: Sterbergia takes full control over SABO.
August 2 1990: Sterbergia allowed hundreds of thousands of foreign troops (mainly American) to be stationed on their own soil.
1992: Constitutional changes, where a consultative council, is established, along with a bill of rights, and the rules of succession for the king.
Thanks for all the advice but I'm kinda making Sternbergia into to be the mega-superpower rival in a Cold War against the US and the free world so its history is gonna be pretty different from Saudi Arabia or any other US supported oil regime. The only thing it has in common with Saudi Arabia maybe is the staunch religious fundamentalism in the ruling regime's ideology with the Wahabbism of SA and the Military Buddhism of Sternbergia.