Gunmen opened fire on security guards at a food market in the southern city of Samara on Saturday, killing at least two and wounding at least five other people, investigators said.
At least six attackers arrived at the market in three cars and opened fire before fleeing, the Investigative Committee said in a statement.
Five people were hospitalized, it said.
Even the smallest of Russian enterprises employs security guards, who are often in the line of fire when business disputes turn violent. State television reported that the Samara market was changing ownership.
Meanwhile, three soldiers in Dagestan were killed when assailants attacked their convoy in a drive-by shooting, said police spokesman Vyacheslav Gasanov.
At about the same time, the top official in a village in Dagestan's Kizlyarsky region was in a separate attack, Gasanov said.
In Ingushetia, a well-known local businessman shot dead a university official to whom he was related, Itar-Tass reported, citing police.
Ruslan Malsagov, who headed Ingushetia State University's economics department, was killed outside his home in the province's largest city, Nazran, by entrepreneur Magomed Malsagov, the report said. The attacker was killed along with two other people — also relatives — in a shootout when police cornered him, it said, without elaborating.