The article reports on the Revolutionary Armed Forces of Colombia (FARC) allegedly concealing parts of their arsenal, including anti-aircraft missiles, despite a peace deal requiring them to surrender their weapons. Intelligence analysts from the U.S. and Colombia suggest that FARC has not disclosed the full extent of their armament and that the disarmament process is poorly controlled. The article also touches on FARC's history of acquiring weapons through the international black market, including a significant purchase from Russian arms dealers. Concerns are raised that FARC's undeclared weapons could enter the international black market and be used by criminal networks. The peace deal allows FARC to retain some arms for security as they transition into a political party.