The United States and its allies are prepared to respond to Russian cyberattacks amid escalating tensions over Ukraine, with the scope of retaliatory actions or sanctions depending on the severity of the hacks, U.S. and European officials said on Tuesday.

U.S. President Joe Biden, speaking hours after Ukraine reported its defense ministry and two banks had been hacked, told reporters that Washington was coordinating closely with NATO allies and other partners to expand defenses against threats in cyberspace.