MOSCOW (Reuters) -U.S. President Donald Trump’s Ukraine envoy said the risk of escalation from the war in Ukraine was “going way up” after Ukrainian forces used drones to strike nuclear-capable bombers at several airbases deep inside Russia.

Ukraine said it attacked airfields in Siberia and Russia’s far north over the weekend, striking targets up to 4,300 km (2,670 miles) from the front lines of the conflict.

“I’m telling you, the risk levels are going way up – I mean, what happened this weekend,” Trump’s envoy, Keith Kellogg, told Fox News.

“People have to understand in the national security space: when you attack an opponent’s part of their national survival system, which is their triad, the nuclear triad, that means your risk level goes up because you don’t know what the other side i

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