Roughly 200,000 people have fled the eastern part of the Democratic Republic of the Congo as fighting there has escalated in recent days, according to U.N. estimates. The M23 rebel group claims to have seized the strategic border city of Uvira, defeating a coalition force of Congolese and Burundian soldiers and sparking the latest surge of displacement. The militant offensive follows recent high-profile peace summits between the DRC, M23, and neighboring Rwanda, which supports M23. Complicating negotiations, M23 has made significant territorial gains this year.