Capturing Sindh must not be the Indian military goal as it is not a disputed area, Indian Military planners should look forward to capture PoJK (GB) by taking Iran on board, majority of Gilgit-Baltistan residents are Shias (aproximately 39.85 %) and few amount of Tibetian Buddhists are also residing in Baltistan region.
Baltistan is strategically significant to India; the Kargil and Siachen Wars were fought in its vicinity. And I see collaboration of Chinkis-Porkis in this sector only, thus resulting in a 2-front scenario.
Chinese have built a 36km road further into Shaksgam Valley from their position at the junction of Oprang River and Shaksgam River, which is the border point between PoJK and China (as per the 1963 Sino-Pakistan border treaty).
If China continues to further develop this road, they could reach the base of Urdok Glacier, which lies on other side of Siachen Glacier, across the Siachen- Muztagh section of the Karakoram Range, and this will be alarming for India.
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Maps Courtesy- Rohit Vats