A Kenyan court rejected a plan to send police officers to Haiti to lead a U.N.-approved mission, throwing into doubt the future of an initiative aimed at tackling gang violence in the Caribbean nation. An opposition party in October challenged the government's decision to send 1,000 officers to address a deepening crisis in Haiti, where gang violence killed nearly 5,000 people and forced around 200,000 from their homes last year. Kenya had hoped to have its officers in Haiti as soon as this month after the United Nations Security Council approved the mission in October, but a court issued a stay on…