"We are shocked by the terrible images coming from Moscow following the horrific attack at the Crocus City Hall," the Greek Ministry of Foreign Affairs stated in a tweet.
"Our thoughts are with the families of the victims, to whom we extend our heartfelt condolences," it added.
The European Union also joined in the condemnation of the attack through its foreign affairs spokesperson.
"The EU expresses shock and disgust at reports of the terrorist attack at the Crocus City Hall concert venue in Moscow.
In a post on the social media platform 'X', EU spokesperson for foreign affairs Peter Stano stated:
"The EU is shocked and expresses disgust following reports of a terrorist attack at the Crocus City Hall concert venue in Moscow. The EU condemns any attack against civilians. Our thoughts are with all those Russian citizens who have been affected."