United Nations Secretary-General Antonio Guterres denounced the airstrike in western Sudan, which killed over 22 people, according to the UN deputy spokesman's statement.
The UN chief added that he was "appalled" by reports of "large scale of violence" in the Darfur region and alarmed by renewed fighting in the country.
"He [Guterres] is also concerned about reports of renewed fighting in North Kordofan, South Kordofan and Blue Nile States," the statement said.
Guterres renewed his appeal to the Sudan Armed Forces and its rival Rapid Support Forces to end the fighting and commit to a long-term cessation of hostilities.
Moreover, the UN has backed efforts by the African Union and the Djibouti-based IGAD bloc to end Sudan's crisis, the statement added.
On April 15, clashes flared up between Sudan's regular armed forces and the paramilitary Rapid Support Force, with the epicenter of the fighting centered in the Sudanese capital of Khartoum.
The fighting has since engulfed the capital and the western Darfur region, despite a series of truces and efforts by the international community to establish peace.
In early July, Malik Agar, deputy chairman of Sudan's Transitional Sovereign Council, told Sputnik Africa that the ongoing armed struggle is primarily an internal Sudanese issue, but other countries, "big" ones like Russia, "have a weight that they can put in," and play a certain role in resolving the conflict.