U.S. intelligence agencies concluded that Russia's recent disclosure of a nuclear-armed underwater drone submarine was a deliberate leak, according to analysis of Russian video news reports and official Moscow statements.

The Russian government-aligned NTV television station revealed a secret document during a Nov. 10 broadcast of remarks by President Vladimir Putin criticizing U.S. missile defenses.

The document shown during the broadcast revealed images of the drone submarine, including its nuclear warhead and nuclear power plant and two larger submarines used to transport it.

U.S. officials who analyzed the video said the timing of the Russian leader's comments about missile defenses and the disclosure of the drone submarine strongly suggests that the leak was intentional.

Officials said that based on official statements from Moscow, the leaking of the nuclear drone submarine appeared to be part of nuclear saber-rattling and Russian information operations designed to dissuade the United States from deploying missile defenses in Europe that Russia opposes.

A CIA spokesman declined to comment.