At least three people, including a pregnant woman, were killed in overnight Russian strikes on Ukraine, Kyiv said Tuesday, just hours after President Volodymyr Zelenskyy met with allies in London.

Ukraine said Russia was increasing its attacks on civilians as it was "unable" to achieve Kremlin-set aims in a fifth year of Moscow's invasion.

"At least three people were killed, including a pregnant 22-year-old woman, in Chuguiv," Foreign Minister Andriy Sybiga said, referring to a city in the northeastern Kharkiv region.

Emergency services published images of a blaze engulfing residential buildings and parked cars.

Chuguiv Mayor Galyna Minaeiva said the city – southwest of the regional capital Kharkiv – was hit by missiles and Iranian-made Shahed drones.