Chinese structures and buildings at the man-made island on Johnson reef at the Spratlys group of islands in the South China Sea are seen on Sunday March 20, 2022. (Aaron Favila/AP)

Chinese structures and buildings at the man-made island on Johnson Reef at the Spratlys group of islands in the South China Sea are seen on Sunday March 20, 2022. (Aaron Favila/AP)

Chinese structures and buildings at the man-made island on Mischief Reef at the Spratlys group of islands in the South China Sea are seen on Sunday March 20, 2022. (Aaron Favila/AP)

An airstrip made by China is seen beside structures and buildings at the man-made island on Mischief Reef at the Spratlys group of islands in the South China Sea are seen on Sunday March 20, 2022. (Aaron Favila/AP)

Clouds partly cover Chinese structures and buildings at the man-made island on Mischief Reef at the Spratlys group of islands in the South China Sea are seen on Sunday March 20, 2022. (Aaron Favila/AP)

Chinese structures and buildings at the man-made island on Mischief Reef at the Spratlys group of islands in the South China Sea are seen on Sunday March 20, 2022. (Aaron Favila/AP)

Clouds partly cover Chinese structures and buildings at the man-made island on Mischief Reef at the Spratlys group of islands in the South China Sea are seen on Sunday March 20, 2022. (Aaron Favila/AP)

Chinese structures and buildings at the man-made island on Mischief Reef at the Spratlys group of islands in the South China Sea are seen on Sunday March 20, 2022. (Aaron Favila/AP)

Boats are seen beside Chinese structures and buildings on the man-made Fiery Cross Reef at the Spratlys group of islands in the South China Sea on Sunday March 20, 2022. (Aaron Favila/AP)

Chinese structures and buildings at the man-made island on Fiery Cross Reef at the Spratlys group of islands in the South China Sea are seen on Sunday March 20, 2022. (Aaron Favila/AP)