It was up to the Philippines, as the other nation with possible claims on the region, to separately challenge the legality of China’s nine-dash line claim under the law of the sea.

Source: https://citynews.com.au/2023/nine-dash-line-map-trips-barbie-in-vietnam/

Last July 2016, the Permanent Court of Arbitration decided that the Philippines has rights to its EEZ, and that China’s nine-dash line claim — which encompasses part of the WPS — has no legal and historical basis.

Source: https://globalnation.inquirer.net/215863/hontiveros-wants-ph-to-raise-before-un-chinas-harassment-of-filipino-fishers

The PCA declared as invalid China’s nine-dash line claim over the disputed waters.

Source: https://businessmirror.com.ph/2023/10/27/doj-plans-to-file-environment-case-vs-china-early-next-year/?utm_source=rss&utm_medium=rss&utm_campaign=doj-plans-to-file-environment-case-vs-china-early-next-year

The statement must have seemed ironic to many of China’s neighbors, particularly those whose waters have been encroached by China’s “nine-dash line” maritime claim in the South China Sea.

Source: https://thediplomat.com/2023/06/the-trouble-with-chinas-global-civilization-initiative/

Warner Bros. said on July 6 the dashed lines in the film are a “whimsical, child-like crayon” scribble tracing a “make-believe journey from Barbie Land to the real world” and do not represent China’s nine-dash line.

Source: https://www.newdelhitimes.com/barbie-movie-rekindles-china-vietnam-territorial-dispute/