North Korea said Sunday that its latest long-range missile test was a "stern warning" to the U.S. over Washington's bolstered sanctions push and said it would respond with a "resolute act of justice" if provoked militarily.

The nuclear-armed North conducted its second successful test-firing of an intercontinental ballistic missile Friday, a launch that experts said highlighted the country's growing ability to strike targets across much of the U.S. mainland.

"In case the U.S. fails to come to its own senses and continues to resort to military adventure and 'tough sanctions,' the DPRK will respond with its resolute act of justice ," the state-run Korean Central News Agency quoted a Foreign Ministry spokesman as saying in a dispatch Sunday.