In this handout provided by Malacanang Photo Bureau', US president Barack Obama signs the palace guestbook during his two-day State visit at the presidential palace on April 28, 2014 in Manila, Philippines. The Philippines trip is the last leg of his four-nation Southeast Asian visit highlighted by the signing of a ten-year Enhanced Defense Cooperation Agreement between the US and the Philippines. The defense agreement involves greater access of US troops in military bases in the Philippines as well as rotational deployment of US air and sea assets in the country. The United States continues to be a major trading partner of the Philippines, with total trade amounting to US$14.5 billion in 2013. Last year, U.S. was the second largest export destination of the Philippines after Japan, with exports reaching US$7.8 billion.