Frozen Frontline
Since 13 April 1984, Indian and Pakistani troops have confronted each other, eyeball to eyeball, for control of the Siachen Glacier and its approaches in the eastern Karakoram mountain range, adjacent to the borders of India, Pakistan and China. The conflict has resulted in hundreds of casualties, caused more by adverse climatic conditions and harsh terrain than the occasional military skirmish.
This is by far the longest-running armed conflict between two regular armies in the 20th century. However, this is not a declared war. India and Pakistan continue to maintain full diplomatic relations with each other, and have many other ties, including economic and academic. Neither is this a conventional conflict: although both armies are conventionally armed, weather, altitude, and terrain make this uninhabitable region an unlikely zone of armed strife.