Seems both World of Tanks EU Servers and the World of Warships EU Server are down. As I got reports about it, Wargaming posted two announcements:
Downtime – Server temporarily unavailable
We would like to inform you that due to an unforeseen technical issue, the server EU1/EU2 of World of Tanks is currently unavailable.
Our specialists are working to find a solution of the problem.
We are sorry for any inconvenience this issue may have caused.
Best regards from your Wargaming CS Team.
World of Warships – unscheduled server downtime
Due to unforeseen circumstances the server is currently unavailable. We are currently addressing the issue and will bring the servers up as soon as possible. Thank you for your patience and understanding.
Action Stations! Your Customer Service Team
Will keep you posted when the servers are back on.