The defensive pact doesn't even cover that area of the world.
Portuguese India was invaded in the 60's and NATO didn't step in.

Article 6

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 , 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;
on the forces, vessels, or aircraft of any of the Parties, when in or over these territories or any other area in Europe in which occupation forces of any of the Parties were stationed on the date when the Treaty entered into force or the Mediterranean Sea or the North Atlantic area north of the Tropic of Cancer.

NATO being used offensively is part of the unspoken agreement. America would guarantee European defence, and in exchange Europe would back America up in their many escapades around the world.

Trump has repeatedly threatened not to come to Europe's defence in case of a Russian invasion, and has even threatened to invade a fellow NATO member himself. He also does not treat his European allies as allies, but rather as vassals who have to do exactly as he says. The US and Israel unilaterally invading Iran without discussing this with NATO is another example of that.

This kind of behaviour erodes the trust and goodwill that the NATO alliance is based on. It breaks the unspoken agreement.
So why would Europe come and rescue the US out of the mess they made?

Trump gets to slowly figure out what it means for America to lose its soft power.

He lost his track while pandering Trump.

But to be fair, the headline doesn’t reflect the short article well enough.

With deranged and demented serial liars like Trump, it really doesn't matter what you do, they will always find a way to frame everything as being your fault.