Amid increasing suspicion of China’s aggression, the leaders of the United States and Japan are touting an “enhanced” security agreement. 

“Our alliance we have with Japan is purely defensive in nature,” President Joe Biden said during a Rose Garden press conference Wednesday with Japanese Prime Minister Fumio Kishida.

“It’s not aimed at any one nation or a threat to the region,” Biden added. “And it doesn’t have anything to do with conflict. This is about restoring stability in the region.”

Under the new agreement, the U.S. and Japan will upgrade a joint base in Tokyo with 54,000 U.S. troops, set up a joint military council to produce more missiles and other weapons, and increase joint research on artificial intelligence. The two countries also will join a security partnership with the United Kingdom and Australia as a deterrence to China.

Biden met with Kishida at the White House, where a state dinner was set for Wednesday night. On Thursday, the two are scheduled to meet with Philippines President Ferdinand R. Marcos Jr. at a time when Chinese and Philippine vessels have had run-ins in the South China Sea. 

The United States already has a mutual defense treaty with the Philippines. Chinese ships also have been repeatedly intimidating Taiwanese ships in the area.

For Japan’s part, Kishida stressed the need for “rule of law” with regard to China’s hostilities at sea.

“Regarding the challenges concerning China,” Kishida said during the White House press conference, “Japan and the U.S. as global partners should work in close coordination. The president and I are committed to continuing our dialogue with China, but we continue to call on China to fulfill its responsibilities as a world power.”

Biden said he recently spoke to Chinese leader Xi Jinping. 

“I spoke at length to President Xi and we agreed to No. 1, have personal contact with one another … so we know exactly what the other is thinking,” Biden said. “We had a discussion about two weeks ago now. It’s the best way to reduce the chance of miscalculation and misunderstanding.”

The president stressed that the U.S.-Japanese alliance isn’t aimed at China. 

“The things we discussed today improve our cooperation and are purely about defense and readiness,” Biden said. “It’s not aimed at any one nation or a threat to the region. And it doesn’t have anything to do with conflict. This is about restoring stability in the region.”