All these transitions are taking place as the major powers try to solidify their influence in the region.
So will Myanmar, which will chair Asean in 2014. As it takes up this appointment, Myanmar's views and actions will be closely scrutinised.
Topic sentence is not stated here. You need to write it from the information given in the paragraph.
Current Asean chair Cambodia is still groping to find ways to issue a joint communiqué from the last summit meeting, because in its absence many decisions were held up.
Back in the 1960s Thailand played an important role in regional politics, not to mention its principal part in establishing Asean.