Argentina has retired their existing Mirage jet fighters - they are just too old to continue flying. They have been searching for months for aircraft to replace them, but without much luck. Their main effort is aimed at the Israeli Kfir fighters - Israel doesn't use them any more, but have many with close-to-current electronics in storage. Israel wouldn't mind pissing off Britain, but the US has veto power over any sale because Kfirs use American jet engines. Affordable Chinese and Russian options are too short ranged. They are also talking to Brazil about buying Brazilian-manufactured Gripen fighters, but that won't happen for about a decade. And they want fighters now. Argentina might be thinking they are in a limited window to resolve the Malvinas issue militarily. Britain only keeps a single ship in the whole South Atlantic, they don't have any carriers, and their submarines are unreliable. The air defense of the islands consists of 4 Eurofighters, not all of which are flyable at any one time. But Argentina will never have anything to stand up to a Queen Elizabeth aircraft carrier armed with F-35's, so once that is available in a few years (or maybe a few more..) there will be no chance. The British strategy for holding the islands is to protect only Stanley and wait for reinforcements, which is the way to do it because Stanley is the only port in the whole place and you can't maintain an invasion without it.