Indian state of Arunachal Pradesh

China has reacted sharply to India renaming a mountain peak in their contentious Himalayan border area - calling it illegal. This comes after an Indian mountaineering team climbed and named a peak after the sixth Dalai Lama in the Indian state of Arunachal Pradesh. The region is also claimed by China which calls it part of South Tibet. Ishan Garg tells us more from New Delhi.