This is significant because the border in the Galwan Valley was said to have been settled, being free of intrusions and claims till recently. According to Indian officials, this is possibly the first time in several decades that China is openly claiming ownership of the area.

from Times of India https://timesofindia.indiatimes.com/india/galwan-valley-ours-dont-want-more-clashes-china/articleshow/76435559.cms