Speaking at a private dinner for tech security executives at the St. Regis Hotel in San Francisco in late February, America¡¯s cyberdefense chief boasted how well his organizations protect the country from spies.

U.S. teams were ¡°understanding the adversary better than the adversary understands themselves,¡± said Gen. Paul Nakasone, boss of the National Security Agency and U.S. Cyber Command, according to a Reuters reporter present at the Feb. 26 dinner. His speech has not been previously reported.

Yet even as he spoke, hackers were embedding malicious code into the network of a Texas software company called SolarWinds Corp., according to a timeline published by Microsoft and more than a dozen government and corporate cybersecurity researchers.