Sullivan made the remarks on Sunday when questioned about a New York Times article last month that said some unidentified Western officials had suggested US President Joe Biden could give Ukraine the arms before he leaves office.
"That is not under consideration, no. What we are doing is surging various conventional capacities to Ukraine so that they can effectively defend themselves and take the fight to the Russians, not (giving them) nuclear capability," he told ABC.
Last week, Russia said the idea was "absolute insanity" and that preventing such a scenario was one of the reasons why Moscow sent troops into Ukraine.
MP/PR