The unannounced gathering of about 60 parliamentarians from Europe, Asia and Africa is the latest move in Taipei's efforts to persuade fellow democracies to stand against China.
U.S. Deputy Secretary of State Wendy Sherman and Kennedy, the U.S. ambassador to Australia, plan to visit next month as Washington battles for influence with Beijing.
The announcement came in the wake of China's recent overtures to Pacific Island nations and the launch of its third aircraft carrier.
The United States will soon announce plans to better battle illegal fishing in the Pacific, U.S. Indo-Pacific coordinator Kurt Campbell said on Monday.
No individual meetings are currently planned between the U.S. President and Southeast Asian leaders when they gather in Washington for talks on May 12 and 13.
"This development makes it even more important to work toward realizing a free and open Indo-Pacific," Prime Minister Fumio Kishida told reporters after the virtual meeting.
The U.S. secretary of state is due to depart on Monday for Australia, Fiji and Hawaii for meetings with key allies and to reaffirm a commitment to push back against Chinese "coercion."
U.S.-China relations have sunk to their lowest point in decades as U.S. President Joe Biden has sought to leverage ties with allies and partners to counter Beijing's actions.
The comments by U.S. Indo-Pacific coordinator Kurt Campbell were apparently in reference to possible Chinese ambitions to establish Pacific-island bases.
A video feed of Taiwanese Digital Minister Audrey Tang was cut during the summit after a map in her slide presentation showed Taiwan in a different color to China.
