BBC- Followed by-INA
The world is "navigating a dark hour in our shared history" with Russia's invasion of Ukraine, US President Joe Biden told key Asian allies.
The war has now become a "global issue" underscoring the importance of defending international order, he said.
Japanese PM Fumio Kishida echoed his comments, saying that a similar invasion should not happen in Asia.
Mr Biden was meeting the leaders of Japan, Australia and India in Tokyo in his first visit to Asia as president.
The four countries known collectively as the Quad discussed security and economic concerns including China's growing influence in the region - and differences over the Russian invasion.
Biden's comments came a day after he warned China that it was "flirting with danger" over Taiwan, and vowed to protect Taiwan militarily if China attacked, appearing to contradict a long-standing US policy on the issue.
It was later reported that Russian and Chinese warplanes had approached Japanese airspace as part of a joint military patrol, prompting Tokyo to announce it had scrambled jets in response.
Russian officials said the flight over the Sea of Japan and East China Sea was part of an annual military exercise.
Kishida told a news conference that planning the exercise to coincide with today's summit was "provocative".
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