The top U.S. military officer landed in Iraq Tuesday to get an update on the battle against Islamic State militants, saying he sees no prospect right now for Russia to expand its airstrike campaign into the war-torn country. Marine Gen. Joseph Dunford, chairman of the Joint Chiefs of Staff, was making his first trip to the warzone since taking the top post on Octtober 1. He told reporters traveling with him that earlier reports that the Iraqi government wanted Russia to conduct airstrikes in Iraq are no longer in play. He said U.S. officials spoke with Iraqi leaders and were told no Russian strikes have been requested. Dunford said he wants to talk with his commanders to get updates on battles in Beiji and Ramadi.