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.

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.

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).

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.