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.
North Korea is on a quest to develop a long-range missile that will be capable of hitting the US mainland with a nuclear warhead.
The Asia Maritime Transparency Initiative (AMTI) says a satellite image that was taken on March 29 of Woody Island in the Paracel island chain showed the J-11 fighter plane.
The Reuters states that Duterte is planning his visit on Thitu's Independence Day in June.
Suu Kyi's government is facing international criticism for the handling of a crisis in the Muslim-majority Rakhine region.
apan has highly condemned the missile launch and said that it violated UN Security Council resolutions.