engaged Abu Sayyaf since the 1990s. Under President Duterte, the Philippine government sought a peace agreement with the MNLF and MILF, but not the "bunch of criminals" in Abu Sayyaf. The Philippine military intensified operations in 2003, following the arrest of a Filipino-American who was alleged to have sold illegal weapons to the group. The suspect was tagged by US authorities as "one of the United States' most wanted fugitives". He was then deported by the Philippine government to face legal action in the United States. On July 29, 2016, the military gained control of an Abu Sayyaf stronghold in Tipo-Tipo. The Philippine military pledged to eliminate Abu Sayyaf. On August 25, President Duterte ordered the group to be "destroyed" after it beheaded a teenager. Following the incident, the Philippine military sent thousands of troops to fight and destroy Abu Sayyaf. Filipino Army Major Filemon Tan said, "The order of the president is to search and destroy the Abu Sayyaf so that's what we are doing". Both MNLF and MILF began helping to suppress extremism in Mindanao, which helps the peace process for both groups. Philippine security forces collaborated with Malaysia and Indonesia to maintain security in the Sulu Sea. The Indonesian government proposed to station army units in Mindanao to launch a major offensive against Abu Sayyaf. The Indonesian government called on the Malaysian and Philippine armies to launch combined land attacks together on Mindanao, while at the same time urging the Philippine government to allow Indonesia and Malaysia military forces to enter Philippine territory. The Vietnamese military started to hold military exercises against Abu Sayyaf (known locally as "pirates" by the Vietnamese) following the repeat kidnappings of Malaysian and Indonesian sailors. The Philippine military provided one battalion to go against each subgroup. On September 9, following the meeting between President Duterte and Indonesian President Joko Widodo, an agreement was reached to pursue the Abu Sayyaf. The Philippine President said in a statement: However, the government of Indonesia decided to not launch a military operation in the southern Philippines, stating that there is enough Philippine military personnel had been deployed. Indonesia's view was seconded by Malaysia. Philippine military chief Ricardo Visaya warned the Abu Sayyaf that they would continue with further major military operations. The military chief gave notice to Abu Sayyaf members to surrender or be "neutralised", (killed or apprehended). Some 20 Abu Sayyaf surrendered in Sumisip on