Ukrainian President Volodymyr Zelenskyy is promising to retake areas captured by Russia, after Russian President Vladimir Putin congratulated his troops on "achieving victory" in the Luhansk region.
Now, Putin is turning to the Donbas region, CNN reports.
Experts predict the city of Sloviansk in the Donetsk region will become a hotspot for fighting.
The mayor has urged residents to seek shelter as the city faces shelling.
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