PUERTO VARAS, July 2, 2016 (Xinhua) -- (L-R) Mexico's President Enrique Pena Nieto, Peru's President Ollanta Humala, Chile's President Michelle Bachelet and Colombia's President Juan Manuel Santos pose for photos during the 11th Presidential Summit of the Pacific Alliance in Puerto Varas, Chile, on July 1, 2016. The Pacific Alliance, a trade bloc uniting four Latin American nations bordering the Pacific Ocean, announced on Friday its intention to bolster trade relations with the Asia-Pacific region, especially with China. (Xinhua/Jorge Villegas)