evidence: The region is one of the most hotly contested areas in the India-China border dispute, which traces its roots back to the British colonial era. The 1962 Sino-Indian war, sparked by these border disputes, saw China temporarily advance into Arunachal Pradesh and Aksai Chin, another disputed region further west. It would not be the first time troops strayed across the Line of Actual Control, a de facto established after the 1962 conflict. The boundary runs through various disputed regions and is not always clearly delineated. [...] "We strongly oppose any unilateral attempts to advance territorial claims by incursions or encroachments, military or civilian, across the Line of Actual Control," State Department principal deputy spokesperson Vedant Patel said during a press conference earlier this year.