"Over the past decade, Vladimir Putin’s Russia has employed unorthodox foreign policy tools with increasing frequency, intensity, and success. Perhaps the most effective of these tactics has been the use of information warfare designed to affect decision-making in countries Russia considers to be its adversaries. In the target countries, these measures aim to destabilize civil society, erode trust in democratic institutions, and foster uncertainty among allies. If the United States and Europe hope to defend their economies, institutions, and identities, an immediate and effective policy response is required. To date, however, the United States and many of its European partners have struggled to develop policies that combat and counter Russian information warfare. The articles gathered here examine the tools that Russia has used against Ukraine, Poland, the United States, and the European Union, as well as the strategies that these countries have employed to combat Russian information warfare. The joint article by the four authors concisely summarizes the findings and proposes policy options by means of which the democratic countries of the West can address the challenges information warfare poses. The final article looks at Russia, examining controversies around the political role of the aggregator Yandex.news in prioritizing media news." (Introduction, p.2)