The 71-year-old leader says he would not raise the tribunal ruling during the ASEAN events this week.
Among those recently killed last week was Commander Muamar Askali also known as Commander Marwan, an Abu Sayyaf sub-leader known for his maritime piracy and kidnapping.
The United States and North Korea have been stepping up warnings to each other in recent weeks over North Korea's development of nuclear weapons.
Moon Jae-in, the presidential candidate of the Democratic Party of Korea, denounces the move of Thaad deployment.
On Monday, Donald Trump called for tougher new UN sanctions on Pyongyang, saying the North was a global threat and "a problem that we have to finally solve".
South Korean Defence Ministry spokesman Moon Sang Gyun says Seoul is holding discussions with the US Navy.
North Korea is on a quest to develop a long-range missiles that will be capable of hitting the US mainland with a nuclear warhead.
Analysts say Pence's Muslim outreach in Indonesia will likely not be enough to assuage fears that the Trump administration is anti-Islam.
The national elections commission will announce official results in early May.
He is expected to discuss Korean tensions with Japanese Prime Minister Shinzo Abe, as well as hold economic talks with Finance Minister Taro Aso.
Officials say there was a high degree of confidence that it was not an intercontinental ballistic missile.
This move comes after a nuclear-powered US aircraft carrier group steamed towards the region.
Duterte says Beijing warned him that "there will likely be trouble" if every head of state of contending parties go to the disputed islands and plant flags.
A US naval strike force that was led by the nuclear-powered aircraft carrier USS Carl Vinson left Singapore for the peninsula last Saturday.
Donald Trump ordered the US Navy strike group, Carl Vinson, to head towards the Korean peninsula on Tuesday in a show of force against the North's missile threats.