Stop all imports of their agricultural produce until he winds his neck in. Unilaterally supporting the Argentinian economy whilst they increase rhetoric as a potential adversary seems unconscionable. Send a message and support our own industry, kill 2 birds with 1 stone.
Argentina's President Javier Milei:
I want to be clear with the world and express the position of the Argentine State. The Malvinas (Falkland Islands) are Argentine by history and by right. There is no discussion about it.
The islands have been part of Argentine territory since the origins of our nation. In 1833, the United Kingdom occupied the Malvinas (Falkland Islands), expelled the Argentine authorities, and established a colonial situation that continues to this day.
This means that the islanders, being an implanted population in a usurped territory, do not have a legitimate right to self-determination, and that any argument based on referendums held on the islands is invalid.