Camp David, Maryland: US President Joe Biden and the leaders of South Korea and Japan have made their strongest joint condemnation yet of “dangerous and aggressive behaviour” by China in the South China Sea and agreed to deepen military and economic ties.

Biden held a summit with the leaders of the main US allies in Asia, South Korean President Yoon Suk Yeol and Japanese Prime Minister Fumio Kishida, in a bid to project unity in the face of Beijing’s growing power and North Korea’s nuclear threats.

South Korean President Yoon Suk Yeol (left), US President Joe Biden and Japanese Prime Minister Fumio Kishida on Friday. Credit: AP

In a joint statement from Camp David, the country retreat of US presidents, on Saturday (AEST), the three leaders committed to establishing a hotline to consult promptly with each other during crises, and to co-ordinate responses to regional challenges, provocations and threats affecting common interests.

They also agreed to hold trilateral military training exercises annually and to share real-time information on North Korean missile launches by the end of 2023. The countries promised to hold trilateral summits annually.