In a significant escalation of the ongoing war, Russia launched an intercontinental ballistic missile (ICBM), the RS-26 "Rubezh," at the Ukrainian city of Dnipro. The attack, carried out from Astrakhan in southern Russia at 5 a.m. local time, marks the first known use of an ICBM in the conflict, signalling a chilling warning to NATO and Ukraine alike. The RS-26 "Rubezh" is a mobile-ground ballistic missile system derived from the RS-24 "Yars," itself a modernized version of the older Soviet Topol-M system. First tested in 2012, the RS-26 is essentially a shorter version of the RS-24 with one fewer stage....