Two top international diplomats trying to revive peace talks and bring about a ceasefire in Ethiopia’s year-long conflict have returned to the country, the foreign ministry said on Thursday.

Olusegun Obasanjo, a former Nigerian president and now the African Union’s High Representative for the Horn of Africa, and Jeffrey Feltman, the U.S. Special Envoy for the Horn of Africa, both arrived on Thursday, ministry spokesperson Dina Mufti said.

Both men have said they want the Ethiopian government and rebellious Tigrayan forces and their allies to declare an unconditional ceasefire and access for humanitarian aid to all areas in northern Ethiopia affected by the war.