China might just have taken a big step forward in its nuclear capability.

It's reportedly been testing space missiles which could get around US defences, meaning that, theoretically, it's able to launch a nuclear strike on US soil.

So how is the US likely to respond?

Today on The Signal, China's expanding nuclear ambitions. How does a race like this end?

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Dr Jeffrey Lewis, Professor, Middlebury Institute of International Studies in California & Director, East Asia Nonproliferation Project