In a joint statement, the countries said they are "ready to play an active role" to support security guarantees, though details have been scarce.

Gen. David Allvin will step down "on or about Nov. 1," the Air Force announced today, but will remain in his post "until a replacement is confirmed." ...

Adm. Tony Radakin also warned, however, that whoever gets to "artificial super intelligence" first will dominate on the battlefield.