The usual suspects have offices in Asia - Ashursts, Lovells, Norton Rose, A&O, Links, Freshies, Herbies. Some US firms too - White and Case, Weils, Shearmans etc.
Good chance of scoring a seat over there if you get a TC with a firm that gives trainees overseas seats. Check Chambers & Partners Student Guide for an up-to-date list of where the firms send their trainees.