Live updates: Russia hit Ukraine with new medium-range ballistic missile, Putin says | CNN

Russia’s use of a nuclear-capable ballistic missile on Thursday is the latest escalation in the Ukraine war.

It also marks a decisive, and potentially dangerous moment in Moscow’s conflict with the West.

The use of what Vladimir Putin said was a ballistic missile with multiple warheads in offensive combat is a clear departure from decades of the Cold War doctrine of deterrence.

Ballistic missiles with multiple warheads, known as “multiple independently targeted reentry vehicles,” or MIRVs, have never been used to strike on an enemy, experts say.

Ballistic missiles have been the underpinning of deterrence, offering what is known as “mutual assured destruction,” or MAD, in the nuclear age.

The thinking is, if even a few missiles survive a nuclear first strike, there will be enough firepower left in the opponent’s arsenal to wipe out several major cities of the aggressor. That should deter the aggressor from pushing the button on them in the first place.

In that vein, ballistic missiles were designed to stand sentinel over a future where nuclear arms would never again be fired in anger.

But analysts, including Kristensen, argue that MIRVed missiles may invite, rather than deter, a first strike.

The thinking there is that it’s easier to destroy the multiple warheads before they are launched than try to shoot them down as they are dropping at hypersonic speed on their targets.

Videos of Thursday’s Russian strike showed the multiple warheads falling at different angles on the target, and each warhead would need to be defeated with an anti-missile rocket, a daunting prospect even for the best air defense systems.

And while the warheads dropped on the Ukrainian city of Dnipro on Thursday were not nuclear, their use in conventional combat operations is certain to raise new uncertainty in a world already on edge.

Importantly, Russia alerted the US to the use of the missile fired Thursday beforehand. But for even with that advanced warning, any further launches by Putin’s regime will now inevitably ratchet up fears across Europe, with many asking the question: Is this the nuclear one? And has deterrence just died?

Read the full analysis.