Mikhail Kasyanov says he was sitting in a Moscow restaurant when about 10 men burst in, threatened to kill him and then attacked with the baked good. The Kremlin is downplaying the attack.
A total of five individuals are being arraigned in a court in Moscow for last week's murder of Boris Nemtsov, a fierce critic of President Vladimir Putin.
The exact role of the suspects, both from the insurgency plagued North Caucuses region, is still unclear. Nemtsov, a fierce critic of President Vladimir Putin, was gunned down in Moscow last week.
Russian journalist Yevgenia Albats, who followed Boris Nemtsov's career for 27 years, says he was one of the few Russian political figures willing to directly criticize President Vladimir Putin.
Russia's president said Nemtsov's death was a shameful tragedy. Nemtsov was gunned down near the Kremlin on Friday. His supporters blame Russian authorities.
Nemtsov served as a governor and deputy prime minister in the 1990s. He later became an opposition leader and sharp critic of Russian President Vladimir Putin. He was killed on a street in Moscow.