The ceremony will be only the second state funeral for a former prime minister in post-war Japan, after that of Shigeru Yoshida, who led the country following World War II.
Meanwhile, a Colombian police chief said a former Haitian justice ministry official may have ordered the assassination of Haiti's president, citing a preliminary investigation into the murder.
Deby, a close Western ally, was killed in battle with rebels on Monday, raising concern in the US and France that turmoil and uncertainty following his death will hamper the fight against militants across the Sahel region.
The funeral, which will be telecast live on television, will take place within Windsor Castle, but there will be no public processions due to the pandemic.
The latest chorus of international condemnation comes after the defence chiefs of the United States, Britain, Japan and nine other countries denounced Myanmar's military.
A state ceremony was held on Friday in the Turkish capital Ankara for 11 soldiers, who were killed in a helicopter crash a day earlier in Turkey’s Bitlis province.
Officials say they discovered some 50 bodies in unrefrigerated trucks outside a funeral home in New York's Brooklyn neighbourhood following reports of foul odour.
From a death bed to grave, they are unaccompanied.
Social distancing imposed by most countries means burials are only attended by one or two family members. As patients with Covid-19 are treated in total isolation at hospitals, many of them die without a chance to say goodbye to family and friends.
The high amount of coronavirus casualties in Italy has compounded the already short supply of Muslim burial spots.
Iran hits US air base in Iraq with ballistic missiles, marking a sharp surge in the US-Iran tensions.
Hundreds of Iraqis joined the funeral procession of activist Fahem al Tai who was killed in a drive-by shooting in Karbala while returning home from protests. Iraq is expected to see widespread protests on Tuesday.
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