President Volodymyr Zelensky on Tuesday denounced what he called unkept "promises" by the West to protect Ukraine from the Russian military operation.

"It's been 13 days we've been hearing promises, 13 days we've been told we'll be helped in the air, that there will be planes, that they will be delivered to us," Zelensky said on a video broadcast on Telegram.

"But the responsibility for that rests also on those who were not capable of taking a decision in the West for 13 days," Zelensky added.