I spoken to level3 europe about latency problems in WoW EU since this month, they repled:
Good afternoon,
Please be advised that there is presently a sub sea cable failure which is affecting traffic round the level 3 IP network.
This occurred on the 29th June.
The cable is in the process of being repaired and we expect all traffic profiles to go back to normal within the next few days.
Many thanks
EU Support
Level 3 Communications