https://www.bbc.com/news/world-asia-53171124
Some good pictures and maps in the article
Both India and China have devoted money and manpower to building roads, rail links and airfields along the Line of Actual Control (LAC) - the de facto boundary separating them - as well as modernising their military hardware in the region.
India's recent building work, including the DSDBO road, appears to have infuriated China - but China has been busy building along the border for years. Both sides tend to view the other's construction efforts as calculated moves to gain tactical advantage, and tensions flare when either announces a major project.
In the summer of 2017, the neighbours were brought to a stand-off at Doklam plateau, far to the east of Ladakh. That confrontation was also over construction - this time China attempting to extend a border road near a tri-junction between India, China and Bhutan.
India plays catch-up
The completion of the DSDBO road, which connects the crucial Daulat Beg Oldi airstrip - put back in use in 2008 - to the regional capital Leh, has strengthened India's ability to move equipment quickly. The all-weather road lies about 20km from the Karakoram Pass and runs parallel to the LAC in eastern Ladakh.
India has long stationed men at Daulat Beg Oldi but, before the reactivation of the airstrip and the completion of the road, the men there could get supplies only through helicopter drops, and nothing could be removed, turning the airstrip into a "graveyard for equipment".
Additional roads and bridges are now being built to link the road with inland supply bases and border outposts on the LAC, enabling Indian patrols to go further forwa