Coverage of which international situation from 2015 earned the Pulitzer prize for the photojournalist Sergey Ponomarev?
Sergey Ponomarev (photographer):  In 2016 he shared a Pulitzer Prize for Breaking News Photography with Mauricio Lima, Tyler Hicks, and Daniel Etter "For photographs that captured the resolve of refugees, the perils of their journeys and the struggle of host countries to take them in."
i don't know