11,000 miles (18,000 kilometers)
To put that into perspective, the circumference of the earth is ~24,000 miles. From my rough Google Earth calculations, the stated range covers the entire planet except for a tiny sliver of Antarctica and a bit of the ocean nearby.
Why would Russia need a missile with that range? Unless they just really want to take out New Zealand first, it kinda seems like they just picked the largest sensible range value (12,000 miles, halfway around the planet) and then fudged it down a bit because why would you need to fire a missile more than halfway around the planet? Just fire it in the opposite direction.
It’s an interesting thought but you gotta admit it would be silly to have a boss in a game that you absolutely cannot beat. Like your character just gives in to madness/despair as soon as you encounter the boss.
Now maybe if you had a dark souls boss fight while a different big unimaginable entity tries to catch up with you might be interesting. But that also might just be a countdown timer on the boss fight which could be lame if not done well.