Ellie Cook is a Newsweek security and defense reporter based in London, U.K. Her work focuses largely on the Russia-Ukraine war, the U.S. military, weapons systems and emerging technology.

which is modeled after the ballistic missile RS-26 Rubezh. Although the RS26-Rubezh is a designated ICBM, experts note that it is more akin to an IRBM, with the missiles categorized by their ...