NATO was set up to counter Warsaw pact
Wrong way round.
NATO was formed in April 1949. Germany was allowed to rearm and join NATO on 6th May 1955.
The Warsaw Pact was formed in response on 9th May 1955.
NATO has never previously concerned itself with China because its Charter, Article 6, limits its operations too:
“
the territory of any of the Parties in Europe or North America, on the Algerian Departments of France, on the territory of Turkey or on the Islands under the jurisdiction of any of the Parties in the North Atlantic area north of the Tropic of Cancer”.
It is China’s increasing interest and operations in the Arctic regions, Greenland etc and purchasing/negotiating ports and other basing rights within that area - plus cyber attacks and infiltration - which have forced NATO to take notice.