The German Foreign Ministry declared two employees of the Russian Embassy in Berlin "persona non gratae", saying that Russian authorities have not cooperated with the investigation "sufficiently" despite repeated "high-ranking" requests.
"We are forced to carry out a series of retaliatory measures", a representative of the Russian foreign ministry told AFP, declining to be identified.
In their statement, German prosecutors said he was "classified as a terrorist by Russian authorities and persecuted as such". He had previously survived multiple assassination attempts and continued to receive threats after fleeing to Germany in 2016. That request was canceled on July 7, 2015, and a person with the identity of Vadim S. first appears on September 3, 2015, with a Russian passport.
The Foreign Ministry cited Germany's federal prosecutor, who on Wednesday (Dec 4) took over the probe.
Tornike K. was known to have fought against Russian troops in Chechnya.
In recent years, Russian Federation has repeatedly been accused of carrying out assassinations on foreign soil - most notably in the high-profile poisoning of former KGB agent Sergei Skripal in Britain last year.
Germany's federal prosecution service has taken over responsibility for the probe into the shooting, which occurred in broad daylight on August 23 in a small park in the inner-city neighbourhood of Moabit.
Dmitry Novikov, a senior Russian lawmaker, said he thought Moscow would respond in kind to the German expulsions, RIA news agency reported. That request was canceled on July 7, 2015, and a person with the identity of Vadim S. first appears on September 3, 2015, with a Russian passport. "The expulsion of two Russian diplomats is therefore a proportionate and consequential response".
Prosecutors said his visa for travelling to Europe indicated he was a civil engineer working for a company in Saint Petersburg.
He left his hotel in Warsaw on August 22 and his movements between then and the murder were unclear, it said.
It is not clear, they said, what he did between his departure from the hotel and the killing at 11:55 a.m. on August 23 in Berlin.
Krasikov was the subject of an worldwide arrest warrant issued by Russian authorities in 2014 for a murder a year prior in Moscow - a killing that bore hallmarks similar to the Berlin assassination.
The case has been compared with the poisoning of former Russian agent Sergei Skripal in Britain previous year with a Soviet-era nerve agent, widely blamed on Russian intelligence.
After that attack, Western nations banded together to expel more than 100 Russian diplomats they accused of being spies, including 60 from the U.S.