A serviceman was killed in an attack in Russia's North Caucasus republic of Dagestan, a police spokesman said on Saturday.
Unidentified assailants broke into a military base in the Dagestani city of Buinaksk late on Friday and attacked the serviceman with a knife, the spokesman said.
He died in hospital from stab wounds, the spokesman said.
In a separate incident, three servicemen were shot dead by unidentified gunmen in Buinaksk late on Friday.
Russia's North Caucasus, which includes the volatile republics of Chechnya, Dagestan and Ingushetia, sees frequent attacks by militants on police, federal troops and officials.
MAKHACHKALA, July 24 (RIA Novosti)