As tensions rise in the standoff over Ukraine, the Department of Homeland Security has warned that the U.S. response to a possible Russian invasion could result in a cyberattack launched against the U.S. by the Russian government or its proxies.

"We assess that Russia would consider initiating a cyber attack against the Homeland if it perceived the US or NATO response to a possible Russian invasion of Ukraine threatened its long-term national security," a DHS Intelligence and Analysis bulletin sent to law enforcement agencies around the country and obtained by ABC News said.

The bulletin was dated Jan. 23, 2022.

Russia, DHS said, has a "range of offensive cyber tools that it could employ against US networks," and the attacks could range from a low-level denial of service attack, to "destructive" attacks targeting critical infrastructure.