https://www.stripes.com/news/pacific/us-could-regard-cyberattack-on-japan-as-armed-attack-pompeo-says-1.577678
US could regard cyberattack on Japan as 'armed attack,' Pompeo says
Top American and Japanese officials said Friday that a cyberattack on Japan could be regarded as an “armed attack” requiring a response by the United States under a joint security treaty binding the two allies.
“The United States and Japan affirmed that international law applies in cyberspace and that a cyberattack could, in certain circumstances, constitute an armed attack under Article 5 of the U.S.-Japan Security Treaty,” said U.S. Secretary of State Michael Pompeo during a news conference in Washington, D.C.