As the United States grapples with the implications of Kremlin interference in American politics, European countries are deploying a variety of bold tactics and tools to expose Russian attempts to sway voters and weaken European unity. Across the continent, counterintelligence officials, legislators, researchers and journalists have devoted years — in some cases, decades — to the development of ways to counter Russian disinformation, hacking and trolling. And they are putting them to use as never before.

The State Department has people now whose job is to challenge false online claims about the U.S. and our policies. If they’ve been successful, they should expand that effort. It won’t be easy: It has to be done fast and adroitly (two skills not always conjoined in the State Department) to be effective.