The military juntas of Burkina Faso, Mali, and Niger have written to the UN Security Council to denounce what they said was Ukraines support for rebel groups in West Africas Sa1qq¹1hel region, Malis foreign ministry said.

Mali cut diplomatic ties with Ukraine in early August over comments by a spokesperson for Ukraines military intelligence agency, Andriy Yusov, about fighting in Malis north that killed Malian soldiers and mercenaries from the Russian Wagner group in late July.

The military government of Niger followed suit days later in solidarity with its neighbour.

Yusov had said Malian rebels had received necessary information to conduct a successful military operation.

Mali and Niger interpreted Yusovs comments as an admission of Ukraines direct involvement in the conflict, and accused it of supporting international terrorism as a result.

Ukraine has repeatedly called the allegations groundless and untrue. Its foreign ministry did not immediately respond to a request for comment on Wednesday.

The country is still locked in heavy fighting with Russia more than two years after Moscows invasion.

A Tuareg rebel alliance has also said it did not receive any Ukrainian support.

Both ethnic Tuareg separatists and jihadist insurgents operate in north Mali.

The Tuareg said they had killed at least 84 Wagner mercenaries and 47 Malian soldiers over days of fierce fighting in July.

An al Qaeda affiliate separately said it had killed 50 Wagner mercenaries and 10 Malian soldiers in an ambush on one of those days.

In their letter to the Security Council, the foreign ministers of Mali, Niger and Burkina Faso asked it to take responsibility for Ukraines actions and to prevent subversive acts that threaten regional and continental stability.

The letters text was posted on the Malian foreign ministrys social media account.

Diplomats said it was circulated to the 15-member Security Council on Tuesday evening.

Burkina Faso, Mali and Niger have turned their backs on traditional Western and regional allies in favour of Russia since their juntas took power over the past four years.

The July attacks, which took place in Malis northern Kidal region near the border with Algeria, are potentially Wagners heaviest defeat since it stepped in two years ago to help the junta fight jihadist insurgents.

The ethnic Tuareg are a separate group who inhabit the Sahara region, including parts of northern Mali.

Tuareg-led separatists launched a rebellion in 2012 that was pushed back into Malis arid north and later hijacked by Islamist militant groups. (Reuters/NAN)

Nigers General Abdourahamane Tchiani is seen next to Burkniable counterpart Captain Ibrahim Traore, right, in Niamey, Niger, on July 5th(AFP)