Ambassador Kyaw Zwar Minn – who broke with his country’s military junta last month – told CNN he tried to gain access to the embassy on Wednesday for several hours without being able to enter.
Several of his staff were still inside the building and were not allowed out, he also said.
Phone calls to the embassy went unanswered and emails were bounced.
UK Ambassador Kyaw Zwar Minn issued a statement last month calling for Suu Kyi’s release, and pledged to keep the embassy open, following an appeal with the UK Minister of Foreign Affairs, Dominic Raab.
At the time, Raab said in a tweet that he spoke with the ambassador and “praised his courage and patriotism in standing up for what is right.”
The soldiers responded by calling him back. << Since he did not behave in accordance with the given responsibilities, an order [is issued] summon him and send him back to the Foreign Ministry, ”MRTV reported.
A live Facebook broadcast on Wednesday showed several people showing their support for the British Ambassador to Myanmar and expressing confusion with the events of the day.
About 50 people also gathered outside the embassy building in Mayfair, an exclusive part of central London.
London Metropolitan Police officers were also on the ground, warning people to disperse as they violated coronavirus restrictions.
Most of those assembled since dispersed as the evening progressed, but CNN saw at least four police vans full of officers park near the Myanmar embassy.
London Metropolitan Police told CNN in a statement: “We are aware of a protest outside the Myanmar Embassy in Mayfair, London. Law enforcement officers are present. There have been no arrest.”
In a statement to CNN, the UK Foreign and Commonwealth Office said it was “seeking further information following an incident at the Myanmar Embassy in London”.
Myanmar’s military leaders tried unsuccessfully to fire another diplomat in March, after UN Ambassador Kyaw Moe Tun called on members of the international community to use “all means necessary” to help restore the civilian leadership of the country.
He refused to resign, however, a move that was supported by the UN.
Myanmar military spokesman Major General Zaw Min Tun said the junta planned to hold new elections after a year-long state of emergency.
Helen Regan contributed to this report.