WASHINGTON (Reuters) - The United States on Sunday condemned an attack on special monitoring missions in eastern Ukraine and called on Russia and the separatist forces it backs to immediately observe the ceasefire under the Minsk agreements. ‎”We condemn Friday’s targeting of OSCE special monitoring mission (SMM) monitors and the seizure of a SMM unmanned aerial vehicle by combined-Russian separatist forces,” the State Department said in a statement.  “It is imperative that these forces halt their attacks on civilian infrastructure, including the Donetsk water filtration station. We call on Russia and the separatist forces it backs to immediately observe the cease-fire, withdraw all heavy weapons, and allow full and unfettered access to the OSCE monitors.” 