This is reported by Bloomberg, citing sources.
As noted, US officials in conversations with representatives of EU countries expressed concern that the process of agreeing on anti-Russian sanctions is going too slowly.
In addition, according to the agency, the United States is concerned that "European leaders are ill-prepared" to respond to allegedly possible cyber attacks and disinformation campaigns from Russia.
Earlier, American senators proposed to impose sanctions against Russian President Vladimir Putin and a number of high-ranking officials in the event of an aggravation of the situation around Ukraine.
Press Secretary of the Russian leader Dmitry Peskov said that the idea of possible new US sanctions against Russia and its president is comparable to the initiative to break off relations.