The iskander is an effective hypersonic missle, i focused on the hypersonic part because it's the technically harder one. They are precise enough to hit a specific part of a building, powerful enough to destroy it completely (I'm sure some military bunkers could withstand its impact, but surely not many of them), and since they are hypersonic they are extremely hard to intercept. As expected it's the precision guided missile that Russia used the most, and that it has the least left in stock (probably, infos about Russia armament are hard to confirm). As i said the missle is technically impressive, but not being able to produce them in sufficient quantity reduces its impact on the battlefield, but that is an industrial problem, the discussion was started on the technical capabilities of Russia.

They took out electric infrastructure in one of the most heavily air defended country in the world.