The United States has for the first time criticized the Chinese military’s use of radar on Japanese fighter jets last week, as Tokyo refuted Beijing’s claims it had given sufficient advance notice of military drills near Japan.

“China’s actions are not conducive to regional peace and stability,” a State Department spokesperson told The Japan Times via email on Wednesday. “The U.S.-Japan Alliance is stronger and more united than ever. Our commitment to our ally Japan is unwavering, and we are in close contact on this and other issues.”

The criticism was the first comment by U.S. President Donald Trump’s administration following Saturday’s incident that saw Chinese fighters dispatched from the Liaoning aircraft carrier twice illuminate Air Self-Defense Force jets with radar, maneuvers that Tokyo has lambasted as “dangerous.”