According to the White House, a White House cyber security officer will meet with European colleagues this week to address the possibility of Russian cyber assaults against Ukraine.

The White House said that Anne Neuberger, the deputy national security adviser for cyber and emerging technologies, will meet with European Union and NATO officials in Brussels on Tuesday to discuss “deterring, disrupting, and reacting to additional Russian aggression against Ukraine.”

According to the White House, Neuberger will subsequently go to Warsaw to meet with her Polish and Baltic colleagues.

The trip will include discussions with eastern flank NATO allies and virtual meetings with German and French officials, with the goal of preparing for cyber attacks and supporting Ukraine.

The visit comes after a massive cyberattack warning Ukrainians to “be afraid and expect the worst” hit government websites in mid-January, leaving some pages inaccessible and prompting Kyiv to open an investigation.

Kyiv believes a hacker group linked to intelligence in Belarus, a close ally of Russia, carried out the cyberattack using malware similar to that used by a group tied to Russian intelligence.

Russia has massed more than 100,000 troops along the border with Ukraine, spurring fears of war. Although Russia denies it is planning an invasion, it is demanding sweeping security guarantees including a promise NATO never admit Ukraine.