Relations between Argentina and Britain were soured again last May when Britain decided to extend territorial waters to 200 miles around South Georgia and the South Sandwich Islands.
Argentina borders the country of Chile.
Nothing in the text mentions Chile at all, so we don't know without using external knowledge. I guess it's difficult because Chile is never mentioned, but Britain is, so perhaps that somehow confuses the system.
( z1 border :ARG1 ( z2 country :name ( z3 name :op "Argentina" ) ) :ARG2 ( z4 country :name ( z5 name :op "Chile" ) ) )