sentences:  In 2003, with increased private and UN investment in the area, the two countries agreed to establish an integrated frontier zone which treats air travel between border cities as domestic travel and simplifies customs and tariff procedures.Most of the Toledo administration dealings with Chile involved concern over the latter procurement of arms.Despite Toledo's repeated call for regional arms reductions, Chile continued purchasing arms, including 10 F-16 fighters from the U.S. and one hundred Leopard 2 tanks from Germany.