Andaman itself is an unsinkable aircraft base. We can station a few Sukhoi long range fighters equipped with Brahmos at car Nicobar AFB and launch attacks against enemy fleets
See the map, Chinese can go to Strait Sunda and you cannot blockade Malacca strait, your territory in Andaman cannot do that role, remember Indonesia also has territory in Andaman sea.
China can create Air Force and Navy base in Myanmar if India is targeting Chinese merchant fleet. How if they use Western companies to transport their goods ? Like APL and others