All about Sergey Lavrov

Russia must stop propping up 'murderous' Syrian regime, Boris Johnson says

May and Trump eye 'window of opportunity' to press Russia over Syria crisis

US warned of retaliation after missile attack on Syria

Critics savage 'Washington poodle' Johnson for pulling out of Moscow visit

Boris Johnson to visit Moscow in coming weeks

Boris Johnson urges Russia to use influence to halt Aleppo assault

Boris Johnson discusses Syria convoy attack with Moscow counterpart

Johnson hails Syria ceasefire deal

World powers work to craft Syria ceasefire