We begin in the Indian capital of New Delhi. The leaders of the Association of Southeast Asian Nations are meeting on the 25th anniversary of ties between India and the 10-nation bloc.
Myanmar's Aung San Suu Kyi, Indonesian President Joko Widodo and Philippine President Rodrigo Duterte are among those who will discuss maritime cooperation and security. Indian Prime Minister Narendra Modi has invited all of the ASEAN leaders to join him for Republic Day celebrations on Friday.
It will be the biggest gathering ever of foreign leaders at the parade - which celebrates the day when India's constitution went into effect.