The SS-26 Iskander missile has a range of approximately 400 to 500 kilometers, or about 250 to 310 miles. It can carry a variety of warhead types, including earth penetrator, high explosive, or thermobaric. Export models have a shorter, 280-kilometer range (about 175 miles), and a smaller 480-kilogram payload (nearly 300 pounds), while the Russian service standard payload is 480 to 700 kilograms (300 to 430 pounds).
This is more than just posturing from the dickhead in Moscow. Here is some analysis on why this matters. (e: note, old article)
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I think someone did the math wrong