Does this video document the start of an Armed Forces of Ukraine counteroffensive against Russia April 7, 2023? No, that's not true: The video is outdated and depicts Ukrainian troops leaving Debaltseve, Donetsk Oblast in February 2015.
The story originated from a video (archived here) where it was published on TikTok by radarukrr on April 7, 2023, under the title "ZSU counteroffensive has begun." It opened:
One of our defenders is live on his Telegram channel from the start of the attack
This is what the post looked like on TikTok at the time of writing:
(Source: TikTok screenshot taken on Mon Apr 17 08:48:35 2023 UTC).
A few accounts promote the same message with thousands of views, however, the official counterassault has not been announced as of April 27, 2023. Moreover, in his interview with the Japanese newspaper The Yomiuri Shimbun, President of Ukraine Volodymyr Zelenskyy said that Ukraine is unable to begin a counteroffensive campaign due to a lack of weapons and ammunition.