The call comes as concerns grow over the military government's commitment to a "five-point consensus" agreed with regional bloc ASEAN to defuse the bloody crisis that erupted after Myanmar's February 1 coup.

ASEAN foreign ministers are set to meet virtually on Friday evening to debate whether to exclude Myanmar junta chief Min Aung Hlaing from an upcoming summit over his government's intransigence.

The military authorities have said they will not allow ASEAN special envoy Erywan Yusof to meet anyone currently on trial, which includes Suu Kyi.

In a joint statement, the US, Britain, Australia, Canada, South Korea, New Zealand, Norway and East Timor say they are "deeply concerned about the dire situation in Myanmar" and urged Naypyidaw to "engage constructively" with the special envoy.

"We further call on the military to facilitate regular visits to Myanmar by the ASEAN Special Envoy, and for him to be able to engage freely with all stakeholders," said the statement, also endorsed by EU foreign affairs chief Josep Borrell.

This last phrase is an apparent reference to the junta refusing Yusof, who is also Brunei's second foreign minister, access to Suu Kyi.

Rebuffing pressure from several other ASEAN member states, the Myanmar foreign ministry on Thursday insisted Yusof could not "go beyond the permission of existing laws" and urged him to focus on meeting government officials instead.

International pressure has so far had little impact on the junta, which launched a brutal crackdown on protests against its power grab that has so far killed nearly 1,200 civilians.

February's coup ended the country's brief dalliance with democracy after decades of army rule, though the army has pledged to hold elections by August 2023.

The military government, which calls itself the State Administration Council, has defended its actions pointing to alleged vote rigging in last year's election, won easily by Suu Kyi's National League for Democracy.