The nuclear-capable Sarmat intercontinental ballistic missile system was previously touted by President Putin as being capable hitting "any target on Earth" - and is widely believed to be by far the longest-range missile in Russia's arsenal (or in the world for that matter). It's been nicknamed by NATO the "Satan II". 

The Sarmat, which is in a "superheavy" class of missiles, has a short initial boost phase which gives it better ability to elude all conventional anti-missile defense systems, given this results in a much smaller window of time to track it.

By design, its super long-range gives it the ability to reach targets thousands of missiles away in the United States or Europe.

According to its specifications, it's by far the heaviest missile Russia possesses - at over 200 tons - and heavier than all foreign competitors: