Sign up now for FREE unlimited access to Reuters.com Register April 29 (Reuters) – Russia does not consider itself at war with NATO over Ukraine, as such a development would increase the risk of a nuclear war, RIA Novosti quoted Foreign Minister Sergei Lavrov as saying on Friday. RIA Novosti also quoted Lavrov as saying on the Dubai-based Al Arabiya channel that Ukraine was responsible for the stalled peace talks with Russia, blaming what he said were Kiev’s changing negotiating positions. Sign up now for FREE unlimited access to Reuters.com Register Report by David Ljunggren Our role models: The Thomson Reuters Trust Principles.