How long before China makes something similar?
Yeah, Vietnam, Korea, Laos, Cambodia, Thailand, the Philippines, Indonesia, New Zealand, Oceania and Australia.
Arguably, China has already done this. The Ruskies are trying to recreate the Tsarist empire, while the Chicoms want to recreate the Manchu empire - and the Chinese have already succeeded mostly — the only places they haven’t recaptured are Mongolia, Arunachal Pradesh and Taiwan
That would be the Shanghai Cooperation Organization created in 2001 which is China, Russia, and central asia. There are a number of countries(excluding the US) with observer status and Iran and Pakistan being sponsored for full membership.
In the 3rd paragraph it mentions an existing pact which is the Collective Security Treaty Organization.