The rigged and forced referendum by the Indonesians aside, the thing about West Papua is that the ethnic groups in the westernmost island, particularly in the Bird Head's Peninsula favoured unification with Indonesia and they were the ones that supported Indonesia the most. This is logical since the peninsula has strong ties with the Moluccan islands, especially to the aristocracy and traders of Tidore and Ternate with whom they traditionally traded with. Most of Hollandia (now Jayapura), the largest city of the territory AFAIK either supported the independence or even for continued loose association with the Netherlands but the local elites in Fakfak and Manokwari supported Indonesia, with Izaac Hindom, one of the more prominent native local politician in the nascent territory (the Dutch only gave opportunities for local Papuans to advance further in the bureaucracy after the failure of their involvement in Indonesia) later being awarded for his support to the Indonesian clandestine operation with the governorship of Irian Jaya, the new name of Western New Guinea after the Indonesian forcefully integrated the whole territory.
This is also problematic since the Dutch themselves has favoured the natives of Biak Islands and the northeastern half of Western New Guinea for the transitionary administration, seeing them as more loyal and with less ties with the Moluccas (by extension, Indonesia) over those from the Bird Head's Peninsula in key positions. If the Dutch does not address this problem (and OTL they didn't) and West Papua were to declare independence, the elites from the western half might plan to secede unilaterally and join Indonesia.
Mind you, a united "Papuan" idea was not popular in the western half of the island until the excess and corruption of Indonesian rule exacerbated it alongside with the arrival of Papuans from the eastern half of West Papua in the coastal cities of Sorong and Manokwari. There is no single Papuan language that could work as a lingua franca and the lingua franca then and now is Papuan Malay, a Malay creole developed from the Tidore Malay creole. Dutch was never popular as a language in there and even the Dutch administration has never made it a point to teach the language to the bulk of West Papuans in missionary schools.
I have no knowledge about Soviet vessels/aircrafts manned by Soviet pilots themselves but logically that's improbable. There were Soviet trainers in Indonesia for sure but what's the benefit for the USSR to openly antagonise the US in Indonesia which will backfire and prompt the US to support further Dutch presence?
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Also cjc probably you could use an autocorrect of some sort? It's not that I can't understand your points but you do have quite some typos