In New Ukrainian Attacks, U.S. Officials See Signs of a Counteroffensive
New York Times
Kyiv has not formally announced the start of operations. But Russia said that major Ukrainian attacks had begun in the Donetsk region and that it had repelled the assaults and inflicted casualties.
https://www.nytimes.com/2023/06/05/world/europe/ukraine-war-counteroffensive-russia.html