The Kremlin on Thursday said it deplored the lack of progress in talks on Moscow’s demand for security guarantees against NATO’s eastward expansion and strongly rebuffed Western calls for a pullback of Russian troops from areas near Ukraine.

Kremlin spokesman Dmitry Peskov also warned of a complete rupture U.S.-Russian relations if proposed sanctions targeting Russian President Vladimir Putin and other top civilian and military leaders are adopted. The measures, proposed by Senate Democrats, would also target leading leading Russian financial institutions if Moscow sends troops into Ukraine.