Two schools in the town, about 70 kilometres from the Polish border, were also damaged.
Ukrainian lawmakers voted on Tuesday by a large majority to ban the Russian-linked Orthodox Church.
The 2024 Olympic Games in Paris officially begins with a unique show in the middle of the Seine later on Friday.
Polish Foreign Minister Radosław Sikorski said thousands of Ukrainian citizens in Poland had joined a planned volunteer brigade.
Mr Zelensky promised help to all families whose relatives were killed or injured in the attack.
On Wednesday, NATO leaders are meeting in Washington to discuss the alliance’s support for Ukraine in the war against Russia.
Mr Zelensky said 27 people were killed and over 100 others injured across the country in a wave of Russian strikes.
Hungarian government spokesman Zoltán Kovács disclosed this on Tuesday in his post on the social media platform X.
SBU head Vasyl Malyuk said the attack was supposed to be “a gift to Putin before the inauguration.” Vladimir Putin was sworn in as Russia’s president on Tuesday.
Mr Zelensky specifically outlined the types of weapons Ukraine requires.
