Ilia

"Kolya... You can't save everyone... The whole country is at war."

- Ilia to Nikolai, 1918.

Ilia was a member of the Russian Brotherhood of Assassins and a friend of Nikolai Orelov.

In 1918, when Orelov betrayed the Brotherhood in order to save Princess Anastasia from his fellow Assassins, a disapproving Ilia nevertheless helped his friend by giving him the code of the laboratory where Anastasia was being experimented on.

Reference

 * Assassin's Creed Chronicles: Russia