Bhutan will sign a Preferential Trade Agreement (PTA) with Bangladesh in December to further enhance trade and commerce between the two countries.
 
"All necessary works on the PTA have been completed to sign it next month," said Bhutanese Ambassador to Bangladesh Rinchen Kuentsyl when he paid a courtesy call on Prime Minister Sheikh Hasina at Ganabhaban on Thursday.

PM’s Press Secretary Ihsanul Karim briefed reporters after the meeting.

https://www.dhakatribune.com/bangladesh/foreign-affairs/2020/11/26/bhutanese-envoy-dhaka-thimphu-to-sign-pta-next-month