Pro-Ukrainian hackers have delivered an unwelcome birthday message for President Vladimir Putin after an ‘unprecedented’ cyberattack hit Russian state broadcaster VGTRK, which was taken offline by the incident. Some report have claimed Russia’s court systems were also affected, and court documents and decisions have been wiped.

A Ukrainian government source said Ukrainian hackers were responsible for the incident, which coincided with Russian President Vladimir Putin’s 72nd birthday. A smartphone with a displayed Ukrainian flag with the word “Cyberattack” and binary codes over it is placed on a computer motherboard in this illustration taken February 23,