By Michelle Nichols UNITED NATIONS (Reuters) – Russia on Tuesday took its accusation that Ukraine was preparing to use a dirty bomb – an explosive device laced with radioactive material – to the United Nations Security Council, voicing its concerns during a closed-door meeting of the 15-member body. “We’re quite satisfied because we raised the awareness,” Russia’s Deputy U.N. Ambassador Dmitry Polyanskiy told reporters. “I don’t mind people saying that Russia is crying wolf if this doesn’t happen because this is a terrible, terrible disaster that threatens potentially the whole of the Earth.” …