VIENTIANE (Reuters) - The Philippines is proposing a 14 percent increase in defense spending next year to buy new ships and aircraft to boost its fight against Islamist militants and enhance maritime security in the disputed South China Sea.

A military officer escorts President Rodrigo Duterte during a visit at an army Camp Capinpin military camp in Tanay, Rizal in the Philippines August 24, 2016. REUTERS/Erik De Castro

According to internal documents seen by Reuters on Monday, about 130 billion pesos ($2.8 billion) or 96 percent of the proposed defense budget, would go to the armed forces.

The push to beef up military spending reflects regional concern about China’s maritime assertiveness and the new government’s determination to crush the entrenched and lucrative network of the Islamic State-linked Abu Sayyaf rebels behind a spree of kidnappings.

Some 25 billion pesos would go to a modernization programme, the Department of National Defence said in the documents, including the acquisition of two surveillance planes and six close-air support planes to fight Abu Sayyaf.

The rebels, who have their stronghold in two southern islands in the Muslim-majority south, are holding more than 20 hostages of five nationalities.

Abu Sayyaf has this year beheaded two Canadian hostages and President Rodrigo Duterte has ordered the military to “destroy” the group. The government believes it was behind Friday’s bombing in Davao city that killed 14 people.

The government has proposed a 3.35 trillion pesos national budget for next year, which the bicameral legislature is expected to approve before the end of the year.

A senior defense official told Reuters 2017 would be the second year in a row that the government is spending 25 billion pesos for the modernization plan, which is slated to cost 82 billion over a five-year period.

The country is set to award contracts for two frigates for navy and three radar systems for the air force, which are designed to improve monitoring in the South China Sea.

Part of the funds will go to instalments to pay for 12 Korean-made FA-50 jets, two of which arrived last year