Some airlines canceled flights to the Ukrainian capital and troops there unloaded fresh shipments of weapons from NATO members Sunday, as its president sought to project confidence in the face of U.S. warnings of possible invasion within days by a growing number of Russian forces.

President Volodymyr Zelenskyy spoke to President Joe Biden for about an hour, insisting that Ukrainians had the country under “safe and reliable protection” against feared attack by a far stronger Russian military, aides said afterward. The White House said both agreed to keep pushing both deterrence and diplomacy to try to stave off a feared Russian military offensive.

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