A long-awaited exchange of prisoners between Moscow and Kiev has begun, Russian state television reported on Saturday, broadcasting footage of buses leaving a jail in the capital.

The head of Afghanistan's intelligence service resigned Thursday following a deadly raid by security forces in eastern Afghanistan that an official said left four brothers dead.

US Secretary of State Mike Pompeo headed to Brussels on Monday to discuss a proposed Afghan peace deal with the NATO chief and seek fresh engagement with new EU leaders after months of tensions.

More than 100 people are believed to have been killed in an air strike by the Saudi-led military coalition on a detention centre in Yemen, the International Committee of the Red Cross said Sunday.

UN chief Antonio Guterres on Sunday vowed continued support for the Democratic Republic of Congo, grappling with the double scourge of militia violence and an Ebola epidemic.

At least 40 militant leaders were killed Saturday after a missile attack targeted their meeting in northwestern Syria, hours after a Russian-backed ceasefire came into effect, a war monitor said.

President Donald Trump on Thursday said that US troop levels in Afghanistan will drop to 8,600 if a deal is reached with the Taliban and that a permanent presence will remain.

Lebanese group Hezbollah on Sunday said one of two drones that came down over its Beirut stronghold was rigged with explosives and caused damage to its media centre.

Flights were temporarily suspended Saturday at the Libyan capital's sole functioning airport after it was hit by a rocket as two civilian flights were landing, airport authorities said.

Fighting between pro-government forces and separatists in Yemen's second city Aden has killed around 40 people and injured 260 others including civilians, the UN said Sunday.

Pro-government forces and opposition fighters exchanged fire in northwest Syria on Tuesday, killing seven civilians, a war monitor said, after Damascus scrapped a ceasefire.

Damascus resumed air strikes on northwest Syria Monday, a war monitor said, scrapping a ceasefire for the jihadist-run bastion and accusing rebels of targeting an airbase of its ally Russia.