MOSCOW (Reuters) – Russia’s domestic intelligence service said on Monday it had arrested 106 supporters of what it called a Ukrainian neo-Nazi youth group planning attacks and mass murders, adding to a long list of potential flashpoints between the two countries. The Federal Security Service (FSB) said the “Maniacs Cult of Murder” group had been set up by a Ukrainian under the patronage of Ukraine’s intelligence services. Ukraine’s SBU security service denied this, telling Reuters it had no role in the case and was focused on counter-intelligence inside Ukraine. There was no immediate comment from the Ukrainian government. The FSB,...