Regional leaders are to set to meet virtually this week without the coup leader in attendance.
In a tweet, Derek Chollet said had discussed with Singapore ways to limit the Burmese military regime's access to overseas financial assets.
He also hoped that the upcoming Asean meeting would be held in accordance with Asean principles.
A spokesman for the junta said the democracy icon has been charged with crimes.
Indonesia, Thailand, Malaysia and Vietnam also rank at the bottom in the Bloomberg list.
Norwegian firm hopes to sell Telenor Myanmar, says it has become difficult to operate in country.
The US Trade Representative made the remark at an annual meeting of Asean economic ministers on Sep 13.
International voices are calling for Myanmar to take responsibility for the Rohingya crisis and for crimes committed by its forces. Over 700,000 Rohingya fled to Bangladesh since…
A United Nations Security Council visit to Myanmar and Bangladesh finds no easy solution to the Rohingya crisis. The United Nations Security Council visited Myanmar and Bangladesh…