He also set his apartment on fire before going out to shoot people.

Ukraine's prosecutor general, Ruslan Kravchenko, identified the shooter as a 58-year-old man from the Russian capital, Moscow, and said he had used an automatic weapon to carry out the fatal shooting.

Interesting. If true, I wonder (read: speculate with absolutely no evidence; do not take this seriously) if he might've known somebody who died or was seriously wounded during Russia's invasion. Could also just be fullthroated support of the invasion via outright terrorism.