The content originally appeared on: CNN (CNN)Russia has not committed to de-escalate on the Ukrainian border after two rounds of diplomatic talks this week, Deputy US Secretary of State Wendy Sherman said Wednesday, as the US acknowledged it's still unclear whether Moscow intends to use the talks this week as a pretext to claim that diplomacy cannot work. Sherman told reporters that Wednesday's meeting between NATO and Russia ended with a 'sober challenge from the NATO allies to Russia' to […]