Which nation developed the intercontinental ballistic missile known as the Yars?

A recent successful test of the RS-24 Yars intercontinental ballistic nuclear missile was confirmed by the Russian ministry of defense. The Yars intercontinental ballistic missile, developed by Russia, is capable of hitting targets located more than 11,000 kilometers away and has a stated range of 12,000 km. Its strategic capabilities are enhanced by the fact that it can carry multiple independently targetable warheads and is built to deploy multiple re-entry vehicles for independent targeting.