The giant Russian energy company, Gazprom, which controls the world's largest reserves of natural gas, has issued a stark warning to the European Union saying it must decide if it wants to continue receiving supplies of Russian gas.Speaking in an interview for the BBC's Newsnight programme, Gazprom deputy chairman Alexander Medvedev warned that Europe was now at a crossroads. "Only three countries can be suppliers of pipeline gas in the long-term - Russia, Iran and Qatar. So there is no other choice than to deal with these suppliers," he said. "Europe should decide how to handle this situation… and if...