Russia offers conditional help as UK investigates poisoning of former spy

Russia's foreign minister has said Moscow could help Britain investigate the poisoning in Salisbury of an ex-Russian spy, but expressed resentment of suspicions cast on his country.

Sergei Lavrov's comments in the Ethiopian capital Addis Ababa came as British investigators scrambled to unravel the nerve-agent poisoning of Sergei Skripal and his daughter.