On 22 May 2018 the Yuri Dolgorukiy submarine of the Project 955 class performed a successful salvo launch of four Bulava missiles. The missiles were launched from a submerged submarine deployed in the White Sea. According to the navy, the warheads successfully reached their targets at the Kura test range in Kamchatka.
A four-missile launch is rather unusual. It is the first launch of this kind for Bulava (although there were three two-missile salvos in the past). These launches became 29 to 32 in the history of Bulava tests. Previous launch took place in June 2017 - it was a single launch from Yuri Dolgorukiy.
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Video of 4 Bulava Launch
https://iz.ru/746662/2018-05-23/minoborony-pokazalo-pusk-raket-bulava-s-podlodki-iurii-dolgorukii