Just don’t loan them any money.
If only GB had been able to infiltrate John McCain into Argentina at the outset of the Falklands War, they could have wiped out the entire fleet of Skyhawks.
Since production of the Mirage 2000 stopped in 2007 I think its a safe bet that any examples one may find are “second-hand”. Although compared to the A4 it might considered be downright modern.
I remember as a teenager watching video from the Falkland War. The Argentine Air Force was probably the bravest and the hardest fighting group within their entire military.
I still remember their A-4 Skyhawks weaving in and out at almost water level trying to bomb British ships there.