Russian officials say a car bomb has exploded near a military base in the republic of Dagestan, killing two people.
A soldier was killed in a separate blast in the same city.
Today's explosion took place in the city of Kaspiisk on the eighth anniversary of the bombing of a military parade that killed 43 people.
Today is Victory Day in Russia, the country's most solemn secular holiday, commemorating the 1945 defeat of Nazi Germany.
Magomed Umalatov, a regional spokesman for the Federal Security Service, says the two people killed are believed to be the suicide bombers who were in the car.
A regional police spokesman says a soldier was killed today in Kaspiisk when a bomb exploded outside a house where soldiers live.