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The sickening assault occurred as the man walked past the woman, who was chatting to a friend in south-central Ukraine's Mykolaiv Oblast region.
He apparently floored her with a single swift punch to the head in front of her horrified pal.
The incident happened in the city of Pervomaisk and was caught on a nearby CCTV camera.
The victim, named as 24-year-old Yana Rozanova, can be seen strolling past a café when she is attacked by the man, apparently for no reason.