Tezpur, Assam: Defence Minister Nirmala Sitharaman on Thursday visited the Indo-China border in Arunachal Pradesh to inspect the Indian Air Force's Advanced Landing Ground at Pasighat there, a defence spokesman said here. Sitharaman also visited the Chabua IAF base station in Assam's Dibrugarh to witness its Gagan Shakti Exercise 2018, a pan-India exercise which is in its second phase.