Zaporizhzhia has come under relentless Russian attacks recently, with at least two people killed there on Saturday.
The Russian strike on Chornobyl “partially destroyed” a spent nuclear fuel storage building, according to Ukraine’s state-owned nuclear operator, Enerhoatom.
The operator said there were no injuries, and a fire in the building was put out, adding that radiation remained at a normal level.
The body also criticised Moscow for what it called a deliberate threat to nuclear safety, in words echoed by Zelensky.
“Russia deliberately struck this particular nuclear infrastructure facility,” Zelensky said in a post on X, describing the building as an “as extremely critical infrastructure facility” and the attack as “vile”.
He went on to detail Russian overnight strikes in 13 regions, adding that Moscow had launched 88 missiles, more than 3,250 drones and 1,800 guided bombs over the past week.
On Saturday, Ukraine targeted St Petersburg and the surrounding area as the city hosted the final day of a major economic forum, in a drone attack described as “unprecedented” by Russian authorities.
Days earlier, Kyiv had attacked the outskirts of the same city – some 1,000km (620 miles) from Ukraine – as Russian President Vladimir Putin’s flagship forum was getting started, sending a large plume of black smoke over the city’s skyline.
In the four years since Moscow’s invasion began, Ukraine has developed its defence sector, with Kyiv now able to regularly hit targets within Russia.