Police swarmed Moscow on Tuesday, 17 December, after a senior Russian general was killed in the city.
Igor Kirillov was killed outside an apartment building on Ryazansky Prospekt.
His assistant was also killed, a Russian investigative committee said.
Photographs posted on Russian Telegram channels showed a shattered entrance to a building littered with rubble and two bodies lying in the blood-stained snow.
Ukrainian prosecutors had charged Kirillov with the use of banned chemical weapons in the Ukraine war the day before he died.
