Russia has been ordered to immediately stop its war in Ukraine.
The order was given by the United Nation's top court, the International Court of Justice.
Judges at the ICJ voted 13:2 in favour of the judgment, in a wider case brought by Ukraine over allegations Russia manipulated the concept of genocide to justify its invasion.
Zelensky took to Twitter to hail the judgement.
Russia and Chinese Judges voted against the suspension of the invasion.