Many of the paths are bringing civilians into Russia and Belarus.
There are early indications humanitarian corridors aren't being honoured again in Ukraine, for the third time in as many days.
Russia's accusing the country of not complying with agreements, to help evacuate civilians out of cities under attack.
The Red Cross says the road out of Mariupol - an area under some of the heaviest bombardment - is littered with mines.
Though an adviser to Ukraine's president says the city of Chernihiv is back under Ukrainian control.
Russia's accused Ukraine of failing to comply with agreements to allow the safe evacuation of civilians.
The Interfax news agency says that's come from Moscow's defence ministry, and would be the third time in as many days that humanitarian corridors have broken down.
Kyiv has called the process 'immoral' - as routes are taking families into Russia itself.
The UN Human Rights Office has put the number of civilian deaths at 406, 12 days into the invasion.
The Russian Defence Ministry says the humanitarian corridors were disclosed in advance.
Ministry spokesperson Igor Konashenkov says they'll be checking the situation closely.
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