The leaders the United States, Australia, India and Japan on Tuesday reaffirmed their shared goal of a free and open Indo-Pacific region.
As part of the Quad's second meeting in eight months, the Ukraine crisis topped the agenda in Tokyo.
All four sides stressed that such a forceful act would not be tolerated in the Indo-Pacific region.
"We cannot let the same thing happen in the Indo-Pacific region. Under such difficult conditions, we need to be united and show solidarity among the four countries."
Australia's new prime minister, Anthony Albanese, noted his new government's priorities align with the Quad agenda, which the U.S. President Joe Biden underlined as "not just a passing fad."
"The fact of the matter is that we have a lot of work to do to keep the region peaceful and stable. Tackling this pandemic and the next one and addressing the climate crisis as referenced by the new colleague."
The latest agreement also covered a new joint response plan, which will include an information-sharing system to deter China's illegal fishing in the region.
The Quad leaders further agreed to invest more than 50 billion U.S. dollars in infrastructure in the region over the next five years and support developing countries facing debt problems, also a move aimed at keeping Beijing's growing power in check.
They discussed North Korea's recent flurry of military activities and agreed to cooperate for the regime's complete denuclearization.
Kim Dami, Arirang News.