Hackers broke into the official Twitter account of the Russian Prime Minister Dmitry Medvedev and posted a spoof message saying he was quitting.
The fake tweet had Medvedev saying: "I am resigning. I am ashamed of the government's actions. I'm sorry." Medvedev's office rushed to confirm his account was hacked.
Using an informal version of the President Vladimir Putin's first name, the hacker tweeted: "I have long wanted to tell you. Vova! You are wrong!"
More top news
A legendary Bunny, leisure centres and protests from the Anti-Nazi League. There's plenty to learn as Murray and Co bid for tennis glory.
Natasha Kaplinsky has interviewed survivors and liberators of Nazi concentration camps to hear untold stories of the Holocaust
The man jumped the fence while the president and his family were inside celebrating Thanksgiving but was quickly apprehended.