NEW DELHI/SRINAGAR—India’s army said on June 16 that 20 of its soldiers had been killed in clashes with Chinese troops at a disputed border site, in a major escalation of a weeks-long standoff between the two Asian giants in the western Himalayas.China’s foreign ministry confirmed there had been a “violent physical confrontation†on June 15 in the border area. It made no mention of casualties, but India’s foreign ministry said there had been casualties on both sides.An Indian government source said the troops had fought with iron rods and stones, and that no shots had been fired.The deaths were the...