Russia RS-28 Sarmat intercontinental ballistic missile made its first test flight on:

The RS-28 Sarmat sometimes colloquially known in the West as the “Satan II”, is a Russian liquid-fueled, MIRV-equipped super-heavy intercontinental ballistic missile (ICBM) under development by the Makeyev Rocket Design Bureau since 2009. It is intended to replace the R-36M ICBM (SS-18 ‘Satan’) in Russia’s arsenal. The Sarmat is one of the six new Russian strategic weapons unveiled by Russian President Vladimir Putin on 1 March 2018. The RS-28 Sarmat made its first test flight on 20 April 2022, and the Russian government expects the missile to enter service later in the year