predictably, white house is already in damage control and trying to walk it back;
" There is no change in U.S. policy towards Taiwan, a White House official said on Monday, after President Joe Biden earlier signalled a willingness to use force to defend the island nation if it came under attack.
"As the President said, our policy has not changed," said the White House official, who declined to be named.
"He reiterated our One China Policy and our commitment to peace and stability across the Taiwan Strait. He also reiterated our commitment under the Taiwan Relations Act to provide Taiwan with the military means to defend itself."
and per their official statement, someone tried to add in a line to defuse it;
https://www.whitehouse.gov/briefing-room/statements-releases/2022/05/23/japan-u-s-joint-leaders-statement-strengthening-the-free-and-open-international-order/" Prime Minister Kishida and President Biden stated that their basic positions on Taiwan remain unchanged, and reiterated the importance of peace and stability across the Taiwan Strait as an indispensable element in security and prosperity in the international community. "
The whole point of this meeting with Japan was to try to cajole China into rebuking Russia, and Joe Biden just gave China reason to side with Russia