"The United States and Japan affirm that international law applies in cyberspace and that a cyber-attack could, in certain circumstances, constitute an armed attack under Article five of the US-Japan Security Treaty", Pompeo said alongside Japanese Defence Minister Takeshi Iwaya.
The Japanese defence chief said that such an issue is important for the two countries’ deterrence capabilities.
READ MORE: Foreign Minister: Japan Moving Forward to Ensure 'Free, Fair, Secure' Cyberspace
According to the joint security treaty, the US military has the right to utilize lands and capacities in Japan in order to maintain peace in East Asia. In addition, Japan has been hosting several US military bases on its territory since Tokyo's defeat in World War II.