Taiwan -- An alliance member through TRA and NATO

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When Biden replied to the interview by ABC, he said that “Taiwan, South Korea and NATO were fundamentally different situations to Afghanistan and appeared to lump Taiwan together with countries to which Washington has explicit defense commitments.”

Biden added: “We have made — kept every commitment. We made a sacred commitment to Article 5 that if in fact anyone were to invade or take action against our NATO allies, we would respond.  Same with Japan, same with South Korea, same with — Taiwan.  It’s not even comparable to talk about that.”
So, why is NATO involved? 
Does the fact that Japan, South Korea, or Taiwan attacked suggest the U.S. is attacked as well due to the alliance?  If that is the case, then TRA, Taiwan Relations Act, the domestic law of the U.S. though, is a treaty of a coalition between the U.S. and Taiwan without the name. 

U.S. and allies would 'take action' if Taiwan attacked - Blinken    Reuters 20211111

WASHINGTON, Nov 10 (Reuters) - The United States and its allies would take unspecified "action" if China were to use force to alter the status quo over Taiwan, U.S. Secretary of State Antony Blinken said on Wednesday.

Blinken was asked at a forum hosted by the New York Times whether the United States would step in to defend Taiwan in the event of an attack by China. He repeated regular U.S. statements that Washington's role is to make sure the island has the means to defend itself, as is required under U.S. law.

"At the same time, I think it’s fair to say that we’re not alone in this determination to make sure that we preserve peace and stability in that part of the world," Blinken added.

"There are many countries, both in the region and beyond, that would see any unilateral action to use force to disrupt the status quo as a significant threat to peace and security, and they too would take action in the event that that happens."

Blinken did not say what sort of action he was referring to.

U.S. President Joe Biden caused a stir last month when he said the United States would come to Taiwan's defense if China attacked. read more

Those remarks appeared to depart from a long held policy of "strategic ambiguity", not making clear how the United States would respond. But the White House quickly said Biden was not signaling a change in policy, and some analysts dismissed his comments as a gaffe.

The Democratic chairman of the influential House Intelligence Committee, Adam Schiff, last week urged the Biden administration to be less ambiguous about what he called a U.S. obligation to defend Taiwan from attack by China. read more

Blinken's remarks came ahead of a planned virtual meeting between Biden and Chinese leader Xi Jinping, which a source briefed on the matter told Reuters will be held as soon as next week. read more

Asked if the meeting would happen next week, Blinken said it was "coming up soon" but was not more specific.

Reporting by David Brunnstrom Editing by Mark Heinrich