Russia expects Washington to provide an explanation after a report claimed that Pentagon cyber-offensive specialists have hacked into Russia’s power grids, telecommunications networks, and the Kremlin's command systems for a possible sabotage, RT reports.

“If no official reaction from the American administration follows, it would mean state cyberterrorism exists in the U.S. If the threats of the attack, which were published by the U.S. media, are carried out, Moscow would be justified in charging Washington,” Russian Foreign Ministry spokesperson Maria Zakharova said, according to the ministry's website.

NBC News said earlier in an exclusive report that U.S. military hackers have penetrated crucial infrastructure in Russia, “making them vulnerable to attack by secret American cyber weapons should the US deem it necessary.”

The report was based on the account of a senior US intelligence official and top-secret documents. NBC said the hack was carried out in preparation for waging a full-scale cyberwar with Russia.

Kremlin spokesman Dmitry Peskov also commented on the report, saying Russia had “cybersecurity measures taken at the level proper for the current situation, and the threats voiced against us by officials of other nations.”

US officials earlier alleged that countries like Russia and China could use hackers to disrupt American power grids and other crucial infrastructure.