Former US Marine Paul Whelan has been held by the Russian authorities for nearly 17 months after he was arrested in Moscow in 2018 because of a flash drive in his possession that contained classified information.The Russian prosecutor is asking for an 18-year term in a high-security prison for US national Paul Whelan on espionage charges, according to a Moscow court.The court is expected to deliver a verdict in the case in June after the closing arguments.