"The missile hit a designated target at the Kura test site in Kamchatka at the designated time," Capt. 1st Rank Igor Dygalo said, adding that the missile had been launched from a submerged position.
He did not identify the type of missile, saying that the information would be announced later.
"Russian Navy Commander Adm. Vladimir Vysotsky has congratulated the submarine crew on the successfully accomplished mission," he said.
Dygalo added that the Ryazan submarine was under the command of Capt. 1st Rank Igor Stepanenko.
The Kura test range is an intercontinental ballistic missile impact area located in northern Kamchatka. It is an isolated part of the peninsula, surrounded by the Okhotsk Sea and the Pacific Ocean.