In this photo released by Agencia Brasil, U.S. Ambassador to Brazil Liliana Ayalde waves at the Brasilia International airport, upon her arrival to Brasilia, Brazil, Monday, Sept. 16, 2013. The new ambassador to Brazil has landed in Latin America's biggest nation amid hiked tensions between the countries. Ambassador Ayalde is a career diplomat with three decades of experience, formerly the Deputy Assistant Secretary of State for Western Hemisphere Affairs. (AP Photo/Agencia Brasil, Marcello Casal Jr.)BRASILIA, Brazil (AP) — The new American ambassador to Brazil has landed in Latin America's biggest nation amid high tensions between the countries.

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