Germany has accused Russia of ordering the murder of a man killed in a Berlin park last August. Federal prosecutors accused "government agencies of the central government of the Russian Federation" of ordering the killing. A Russian national identified as Vadim K has been charged with the murder. Russia has previously called accusations it was involved in the crime "absolutely groundless" and said it had nothing to do with the death. Zelimkhan Khangoshvili - who lived for a time under the name Tornike Kavtarashvili - was shot dead in broad daylight last August in Berlin's Kleiner Tiergarten park. The 40-year-old Georgian national was a former Chechen rebel commander. German foreign minister Heiko Maas told reporters the Russian ambassador had been called in for talks, adding that the federal government "explicitly reserves the right to take further measures". Media have compared the attack on Khangoshvili to the attempted murder of Russian former intelligence agent Sergei Skripal and his daughter in the UK in 2018.