Afghan National Security Adviser, Hanif Atmar shakes hands with Amin Karim,(R), representative of Afghan warlord Gulbuddin Hekmatyar after signing a peace agreement in Kabul. Pic/AP

Kabul: Afghanistan yesterday signed a peace agreement with notorious warlord Gulbuddin Hekmatyar, paving the way for him to make a political comeback after years in hiding and despite a history of war crimes.