While 'Oreshnik' variant of RS-26 Rubezh can deliver MIRV conventional, kinetic, and nuclear payloads at mach 25 (5 miles a second), IRBMs are too expensive to use. This one was a test and a signal of nuclear saber rattling. There will be no tactical nuclear weapon use or further use of IRBMs.<p>Also note that RAF provided USSTRATCOM notice shortly before the strike to prevent nuclear war as is the international custom for high trajectory space and missile launches. As a result, the US moved B-61 mod 13 dial-a-yield 340kt warheads to Łask Air Base Poland for the increased readiness of potential delivery by new Polish F-35A fighters and upped the alert level of Ohio-class ballistic missile submarines.<p>Putin could use nukes once, but then he can never live or move above ground ever again, and BRICS would become BICS (geopolitically and economically).<p>Вооружённые Си́лы Росси́йской Федера́ции, Vooruzhyonnyye Sily Rossiyskoy Federatsii (Russian Armed Forces) leaks like sieve. There are zero signals from it indicating an increase in posture towards nuclear war.