The head of Ukraine's security council, Oleksiy Danilov, had called on Russia to create humanitarian corridors to allow children, women and the older adults to get away from the fighting, calling such corridors ``question No. 1.''

As Russian forces batter strategic locations, Ukrainian President Volodymyr Zelenskyy has lashed out at NATO for refusing to impose a no-fly zone over his country, warning that ``all the people who die from this day forward will also die because of you.''

NATO said a no-fly zone could provoke widespread war in Europe with nuclear-armed Russia. But as the United States and other NATO members send weapons for Kyiv and more than 1 million refugees spill through the continent, the conflict is already drawing in countries far beyond Ukraine's borders.

Russia continues to crack down on independent media reporting on the war, also blocking Facebook and Twitter, and more outlets say they are pausing their work inside the country.

And in a warning of a hunger crisis yet to come, the U.N. World Food Program says millions of people inside Ukraine, a major global wheat supplier, will need food aid ``immediately.''

Ukraine's president was set to brief U.S. senators on Saturday by video conference as Congress considers a request for $10 billion in emergency funding for humanitarian aid and security needs.

In a bitter and emotional speech late Friday, Zelenskyy criticized NATO over the lack of a no-fly zone, saying it will fully untie Russia's hands as it escalates its air attack.

``The alliance has given the green light to the bombing of Ukrainian cities and villages,'' he said, warning that ``the history of Europe will remember this forever.''

NATO Secretary General Jens Stoltenberg earlier in the day ruled out the possibility of a no-fly zone, saying NATO planes would have to shoot down Russian aircraft.

In a separate video message to antiwar protesters in several European cities, Zelenskyy continued to appeal for help. ``If we fall, you will fall,'' he said.

The U.N. Security Council scheduled an open meeting for Monday on the worsening humanitarian situation. The United Nations estimates that 12 million people in Ukraine and 4 million fleeing to neighboring countries in the coming months will need humanitarian aid.

Russian forces did not make significant progress Friday in their offensive to sever Ukraine's access to the Black Sea and the Sea of Azov, which would deal a severe blow to the country's economy. There were also no changes in the north and the east, where the Russian offensive has met fierce Ukrainian resistance.

While a vast Russian armored column threatening Ukraine's capital remained stalled outside Kyiv, Russian President Vladimir Putin's military has launched hundreds of missiles and artillery attacks on cities and other sites across the country.

Ukrainian presidential adviser Oleksiy Arestovich said battles involving airstrikes and artillery continued northwest of Kyiv, and the northeastern cities of Kharkiv and Okhtyrka came under heavy fire.

He said Ukrainian forces still held the northern city of Chernihiv and the southern city of Mykolaiv. Ukrainian artillery also defended Ukraine's biggest port city, Odesa, from repeated attempts by Russian ships, he said.

More than 840 children have been wounded in the war, and 28 have been killed, according to Ukraine's government. A total of 331 civilians had been confirmed killed, but the true number is probably much higher, the U.N. human rights office said.

Kyiv's central train station remained crowded with people desperate to flee the capital. ``People just want to live,'' one woman, Ksenia, said.