As portuguese I'm proud of my country for doing that. I hope this is the start of a more active role within EU, especially because we've been sitting too comfortably as a nation. Also because we're the closest ones to the US and the west EU entry point.
Needless to be said, before the "acshually" movement starts saying "they didn't have an F-35 order", they did have the intention to buy them, just like the old F-16's.
Regardless, Trump is an immature toddler who puts up tariffs against other nations and as soon as they counter him he immediately removes them and starts crying about unfairness.
In his case "not buying the planned F-35's" pretty much = "Blowing up purchased and delivered F-35's to send a message".
Sad that they never learn their lesson and we're all stuck in this cycle of:
Rich person buys power > Makes life a living hell for the people > The people revolt and burn everything down > Rich person (hopefully) gets dragged through the streets and has a public medieval-like execution as an example > Peace with rules in place to prevent that from happening again > People generations later get lax > Another rich prick comes along and exploits the weakness of the system and meekness of the people.
And round and round we go. As they say, "Strong men create times of peace, weak men create times of conflict".