TOKYO - Japanese Prime Minister Fumio Kishida and U.S. President Joe Biden agreed Monday to boost the strength and deterrence of their nations' alliance amid growing concern that Russia's war in Ukraine could embolden China to take further assertive behaviors over Taiwan and other potential flashpoints in the Indo-Pacific region.

Following their first in-person, sit-down meeting in Tokyo, Kishida said at a joint press conference the two leaders "reaffirmed that any attempt to change the status quo by force is absolutely impermissible, regardless of the location," and that they oppose such attempts in the East China Sea, including the Japanese-controlled Senkaku Islands, and the disputed South China Sea.

Japanese Prime Minister Fumio Kishida (R) and U.S. President Joe Biden attend a joint press conference in Tokyo on May 23, 2022. (Pool/Getty/Kyodo)