Ukrainians fleeing into central European pleaded for Western nations to take tougher steps against Russia following Moscow’s invasion that has created more than 1 million refugees.

At the Medyka crossing, Poland’s busiest, along its roughly 500-kilometre (310-mile) border with Ukraine, refugees called for a no-fly zone over Ukraine — something NATO powers have so far ruled out on the grounds it would risk escalating the conflict beyond Ukraine.

“Please close the sky,” said Solomiya Zdryko, 18, who fled from Lviv in western Ukraine. “I know that it’s not possible for us to join NATO but at least close the sky because people are dying.”

“It’s great that the whole world is watching us and supporting us, but it really needs to stop.”

The number of refugees could potentially rise to 1.5 million by the end of the weekend from a current 1.3 million, according to the head of the U.N. refugee agency, Filippo Grandi.

“This is the fastest moving refugee crisis we have seen in Europe since the end of World War Two,” Grandi told Reuters in an interview.

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