pb
I can't think of any short term measure that would work, but why bother when Kirschner is screwing up Argentina's economy better than any sanctions ever would? Despite a lot of hot air from the Casa Rosada the UK has the upper hand militarily, diplomatically and economically. I'm with Whenurhappy on this, the best thing for the UK to do is nothing.
Milo
On the contrary, Argentina depends very heavily on foreign investment and is unlikely to do anything to jeopardise that. Their industrial base would fold without such investment, and nationalising any foreign assets would shut that door for a very long time. As for punitive taxation, well they already do that to their MERCOSUR partners
TTFN