In fact we have already seen how they cosy up to dictators during wartime. The USA spent decades and decades backing military coups and assassinating democratically elected leaders all over the world under the guise of fighting the Cold War only to suddenly do a U-turn and pander to Putin. Russia has won the Cold War without direct military confrontation with the US.
We have also seen how Trump's first administration betrayed the Afghan government by negotiating directly with the Taliban and locking the Afghan government out of the process. He's doing the same now with regards to the war in Ukraine.
If you know any Taiwanese people, ask them whether the removal of "we don't recognize Taiwan as a sovereign nation" brings them any comfort in light of how the Trump administration is treating Zelensky and America's NATO allies. Ask them what they think of Trump's expansionist rhetoric about annexing Canada, one of America's most steadfast allies with centuries of friendship.
Talk is cheap, and Taiwan as well as America's other Pacific allies are beginning to see through it.