The head of Sudan's Rapid Support Forces (RSF) has claimed his fighters were prepared to wage war for decades against the country's regular army, warning that RSF forces remain positioned outside the army-controlled capital.

"We do not want this war to continue," RSF chief Mohamed Hamdan Daglo told a group of soldiers at an undisclosed location late Wednesday.

But "if they (the army) want it to go on for 40 years, it will continue until they are uprooted."

The remarks by Daglo came a day after Sudan's army-aligned government accused Ethiopia and the UAE of launching drone attacks since March on several states across Sudan from inside Ethiopian territory, including strikes on Monday against the capital Khartoum and its airport.

The UAE has been accused of arming the RSF but denies the allegation, while Ethiopia has denied hosting RSF and UAE forces on its territory.