Here’s what you need to know about the Ukraine crisis right now:
* President Vladimir Putin put Russia’s nuclear deterrent on high alert on Sunday in the face of a barrage of Western reprisals for his war on Ukraine, which said it had repelled Russian ground forces attacking its biggest cities.
* Blasts were heard in the capital of Kyiv and in the major city of Kharkiv on Monday morning, Ukrainian officials said, while a residential building in the city of Chernihiv in northern Ukraine was on fire after being struck by a missile.
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