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More 'torture chambers' uncovered, Ukraine's police say; Russia says its economy cannot be undercut

This was CNBC's live blog tracking developments on the war in Ukraine. See here for the latest updates. 

Russia unleashed further attacks on Ukraine overnight, after a wave of missile strikes on Monday left major Ukrainian cities reeling.

The attacks left many residents of Kyiv without water or power. Mayor Vitali Klitschko said that water and power supplies to the capital's residents were restored by Tuesday morning.

He also slammed Russia's "barbaric attacks" on the city yesterday. More shelling was reported in the south and east of Ukraine on Tuesday morning.

Russia unleashes a barrage of air strikes against civilian infrastructure in Ukraine
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Russia unleashes a barrage of air strikes against civilian infrastructure in Ukraine

Elsewhere, the United Nations has warned that global food prices are likely to start rising again, due in part to the collapse of the Black Sea Grain Initiative — a deal between Ukraine and Russia that saw vital agricultural exports from Ukraine resume.