VIENNA, AUSTRIA - JUNE 23: Lieutenant General Thomas Bussiere Deputy Commander United States Strategic Command, and U.S. arms control envoy Marshall Billingslea speak at a press conference on June 23, 2020 in Vienna, Austria. U.S. arms control envoy Marshall Billingslea and Russian deputy foreign minister Sergei Ryabkov met on Monday to talk about their countrys' nuclear arsenal. (Photo by Thomas Kronsteiner/Getty Images)

MOSCOW (AP) — The Kremlin says the security talks with the U.S. over tensions in Ukraine have given little reason for optimism, adding that Russia would wait for the outcome of other meetings this week before deciding whether it’s worth to continue negotiations. The leader of the U.S. delegation at Monday’s talks briefed allies in Brussels about the session and stressed the security crisis was “caused by Russia” and its troop buildup near Ukraine. At the Geneva talks, Moscow insisted on guarantees to halt NATO’s eastward expansion and even roll back the military alliance’s deployments in Eastern Europe, while Washington firmly rejected the demands as a nonstarter.