The EU sees more cooperation ahead.

"This is a very serious incident, affecting our most important democratic institution,” Norway's foreign minister said.

A new report from FireEye does not attribute the effort to the Russian government, though the motives are consistent.

The tactic is consistent with prior Russian efforts, experts say.

There’s a groundswell of support for making collective countermeasures in cyberspace lawful despite an uncertain legal landscape.

An administration effort to convince European allies to blacklist Huawei largely has fallen on deaf ears.