United Nations calls for safe passage to deliver humanitarian aid to conflict zones in Ukraine.
UN official says civilians should also be allowed to leave areas of active hostilities on a voluntary basis -- in the direction they choose
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IAEA says it has received reports of artillery shells damaging a nuclear research facility in Ukraine's besieged second city Kharkiv.
No increase in radiation levels have been reported at the site
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VIDEO: Aftermath of the Russian military operation in Kharkiv, Ukraine.
Kharkiv has endured almost non-stop fire in recent days
VIDEO: No safe corridor, just a plank for those fleeing to Kyiv.
Ukrainians flee south towards Kyiv across a bombed-out bridge as Russian forces continue to bombard the town of Irpin, northwest of the capital
Five reasons why Ukraine has been able to stall Russian advance
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Russia says it plans to open humanitarian corridors in Ukraine - with most of the routes leading into Russia or its ally Belarus.
Kyiv insists the move is a publicity stunt as the invading forces are maintaining a devastating shelling campaign
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'Hand-to-hand combat': Street battles rage on Kyiv's edge
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