The Burmese ambassador in the British capital, Kyaw Zwar Minn, accused the military attache of "occupying" by order of the junta, the diplomatic representation and prohibiting his access.
On Thursday, the United Kingdom condemned the "intimidation" of the Myanmar regime after a military attache took control of that country's embassy in London.
"We condemn the acts of intimidation by the Myanmar military regime in London yesterday (Wednesday)," wrote British Foreign Minister Dominic Raab Raab on Twitter.
On Wednesday, Myanmar's ambassador to London, Kyaw Zwar Minn, accused the military attaché of "occupying", by order of the junta, diplomatic representation and denying him access.
The military junta called the ambassador for consultations in March after the diplomat issued a statement calling for the release of the civilian leader deposed in Myanmar, Aung San Suu Kyi.
Kyaw Zwar Minn told The Daily Telegraph on Wednesday, When I went to the embassy, they hurried inside and got it. They belong to the Burmese army.
Protesters gathered around the Burmese embassy in London on Wednesday when it was made public that the ambassador could not enter.
The United Kingdom, a former colonial power, sanctioned several military junta officials, including its chief Min Aung Hlaing, for their role in the February 1 coup that overthrew the Burmese civilian government led by Suu Kyi.
The ambassador has denounced that there has been a "coup" at the diplomatic headquarters, as he has expressed to 'The Telegraph', to whom he has detailed that they refuse to let him pass, since "they have received instructions from the capital", in reference to Naipyidó.
Kyaw Zwar Minn, however, has predicted that the British rule will not support it. "In this sense, a spokesman for the Ministry of Foreign Affairs has advanced that they are "gathering more information after an incident at the Burma embassy in London," reports DPA.
Reports the BBC, The ambassador, who in March called for the release of the country's 'de facto' leader deposed by the coup, Aung San Suu Kyi, and condemned the military coup, for which the government dismissed him from his post.
During the night of Wednesday, Kyaw Zwar Minn has been seen outside the diplomatic headquarters ringing the bell without success, talking to the Metropolitan Police, and leaving the vicinity in a car with a large photograph of Suu Kyi in the back of the vehicle.