US citizen Paul Whelan, who was arrested in Russia on suspicion of espionage, has filed an appeal against a Moscow court's decision to detain him without bail.
Moscow's Lefortovo court received the appeal from Whelan's lawyer on Thursday, the court's press service told state news agency TASS on Thursday.
Whelan's lawyer, Vladimir Zherebenkov, said on January 3 that he filed a complaint with the Lefortovo court because the detention without bail is "excessive and unwarranted."
Whelan, who is also a citizen of the United Kingdom, Ireland and Canada, was arrested December 28 by Russia's Federal Security Service. If convicted he faces up to 20 years in a Russian jail.