He made the announcement on Fox News.
“At the moment, we continue to believe that there is still time and opportunity for diplomacy,” Kirby quoted RIA Novosti as saying.
He also stated that there is no reason why "the situation should escalate into a military conflict or turn into severe economic consequences."
Earlier, NATO Secretary General Jens Stoltenberg explained the decision of the North Atlantic Alliance to respond in writing to Russia's security proposals by saying that the alliance seriously intends to make progress in negotiations with Moscow.