Poland

Medyka is the busiest border crossing between Poland and Ukraine. Aid workers flocked there to set up tents offering assistance when the war started. But these days, the flow of refugees has shifted.

Lilia Nguyen's perception of everything around her changed when she went to the border to help Ukrainian refugees shortly after the war began. The change has been felt by other young Poles.

It was seen as a way for Russia to prop up its currency and retaliate for Western sanctions, but it could cause global energy prices to spike. One analyst sees it as a warning to the rest of Europe.

The governments of the two European countries said Russian energy giant Gazprom informed them it was halting gas supplies starting Wednesday.

Spooked by reports that traffickers are waiting at the Ukraine-Poland border, a Polish woman started an all-women car service to drive Ukrainian refugee women and children to homes or shelters.

More than 150,000 displaced Ukrainians now live in Krakow, increasing the population by 20% in just a few weeks. Now the city is helping them find long-term housing, jobs and spots in schools.

Refugees streaming across the border at the Medyka border crossing into Poland leave behind the air raid sirens and the sounds of war and are welcomed by musician Davide Martello.

"While others in Europe looked at Russia as a business partner," the Polish prime minister said, "we saw that Russia uses gas and oil as a way to blackmail."

The twin boys, Lenny and Moishe, were born just as Russia invaded Ukraine. A specialist team of U.S. Army veterans hatched a desperate plan to bring them into Poland and, hopefully, to safety.

More than 500,000 people have left Ukraine since Russia's invasion started last week, according to the United Nations' refugee agency.