LONDON — The United States and Ukraine signed a new partnership document on Thursday that will enhance Ukraine’s defenses and allow for more cooperation between the two countries on reforming Ukraine’s military structure. As part of that agreement, Defense Secretary Ash Carter has appointed retired Army Gen. John Abizaid to be senior adviser to Ukraine.

Carter and Ukrainian Minister of Defense Stepan Poltorak signed the Partner Concept during a bilateral meeting on the sidelines of the UN Peacekeeping Ministerial in London.