Officials from Russia and the United States have been holding security talks in Geneva, in a week of diplomatic activity to defuse tensions over Ukraine. Russian deputy foreign minister Sergei Ryabkov and his delegation have begun face-to-face discussions with Wendy Sherman, the US deputy secretary of state, and her team. Ms Sherman is one of the world's most powerful diplomats, nicknamed the Silver Fox because of her snowy white mane and canny deal-making style. Pray that their meetings will kickstart dialogue between Moscow and Washington, whose relations are at a low point over Russia’s military buildup near Ukraine. The negotiations have been particularly gruelling, say analysts, and Ms Sherman will need all the diplomatic tricks she can muster to avoid a major war in Europe. Sergei Ryabkov brings a list of demands the US officials must agree to, including not expanding NATO forces eastward or allowing Ukraine to join NATO. See also the next article and