It's "very important" that Europe responds to Russia's "unprecedented" behavior, the Vice President of the European Commission Valdis Drombrovskis told CNBC, in the wake of the nerve agent attack on a former spy.
Several European countries decided to expel some Russian diplomats from their national territories last month. The decision followed a nerve agent attack on a former spy, Sergei Skripal, and his daughter in the U.K. The British Prime Minister Theresa May blamed Russian President Vladimir Putin for the attack.
"Certainly there are concerns with this Skripal case. It was indeed chemical weapons used on European territory, so it's quite unprecedented," Dombrovskis told CNBC's Steve Sedgwick at the sidelines of the European House Ambrosetti Forum on Saturday.
"Europe has been clear it's not going to tolerate some kind of aggressive behavior from Russia," the former Latvian Prime Minister said, noting that it's "very important" to react to that kind of behavior.