[red-iron-pine]

NATO cannot be called in to defend Taiwan. NATO article 6 makes this perfectly clear:

"For the purpose of Article 5, an armed attack on one or more of the Parties is deemed to include an armed attack: on the territory of any of the Parties in Europe or North America... [or] on the islands under the jurisdiction of any of the Parties in the North Atlantic area north of the Tropic of Cancer..."

The US may invoke ANZUS or treaties with Japan and SK.

If China attacks the US directly, such as attacks on US soil, that might change, but it is highly unlikely that NATO would ever get directly involved.