Russian missiles pounded the city of Mykolaiv on Thursday, officials said, after a U.N. General Assembly resolution called Moscow's annexation of Ukrainian territory "illegal" and Ukraine's allies committed more military aid.

"A five-story residential building was hit, the two upper floors were completely destroyed, the rest — under rubble. Rescuers are working on the site,” Mykolaiv's Mayor Oleksandr Senkevich said in a social media post, adding that the southern city was "massively shelled."

A shipbuilding center and a port on the Southern Bug river off the Black Sea, Mykolaiv has suffered heavy Russian bombardments throughout the war.