The flight distance from Kaliningrad to London is: 886.65 miles / 1426.92 km, which is more than the 700 kilometres (435 miles) for Iskander. The flight distance from Kaliningrad to Paris is 886 miles / 1425.88 km. The flight distance from kaliningrad to Brussels is 736.48 miles / 1185.25 km. The flight distance from Kaliningrad to Amsterdam is 660.03 miles / 1062.22 km.
Iskander could hit e.g. Berlin (Germany), Copenhagen (Denmark), Prague (Czech republic). Vienna (Austria) is on/just over the limit, so are Bratislava (Slovakia), Budapest (Hungary).
So the Iskander threat is mainly a chunk of Sweden and Finland, Estonia, Latvia, Lithuania, Poland and a chunk of Germany