Russia has warned NATO it could use nuclear weapons to defend Kaliningrad if allies attempt to cut off the exclave

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New research points to how the world could stop short of the brink of disaster. Even with the agreement signed at the White House by tech leaders, it won’t be easy.

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Poland accuses Russia of carrying out a coordinated and multi-faceted campaign of sabotage in a bid to deter Ukraine’s backers, writes James C. Reynolds

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Moscow vows to use its ‘entire arsenal, including nuclear weapons’ if threatened

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