He added that summer rains threaten to contaminate water sources as he pressed Russian forces to allow residents to safely leave the city.
Read here Ukraine's railway operator asks Russia to remove the bodies of soldiers
In addition to the humanitarian catastrophe created by the (Russian) occupiers and collaborators, the city is on the verge of an outbreak of infectious diseases, he said on the messaging app Telegram.
Azovstal
The last group of Ukrainian soldiers holed up in the smashed Azovstal steelworks have surrendered, after Ukrainian president Volodymyr Zelenskyy said the defenders had been told by commanders that they should leave.
Ukraine hopes to exchange the surrendering Azovstal soldiers for Russian prisoners.
Russian troops had completely ruined the city.