Russian military personnel have entered an airbase in Niger that is hosting American troops, after a decision by Niger’s junta to expel US forces from the country. The military officers ruling the west African country have told the US to withdraw its nearly 1,000 military personnel, which until a coup last year had been a key partner for Washington’s fight against insurgents who have killed thousands of people and displaced millions more. A senior US defence official, speaking on condition of anonymity, told Reuters that Russian forces were not mingling with US troops but were using a separate hangar at...