Russia is now almost surrounded by US missile defense systems, from ground-based bases in Eastern European countries, to NATO ships patrolling the Mediterranean and the northern seas, and Alaska, where missile defense systems are currently being installed.

This, the president stressed, was “another big, glaring strategic mistake [by] our partners, because Russia will give a suitable response to all of these actions, and this will mean nothing else other than another phase of an arms race. Our response will be much cheaper. Its [equipment] may be rougher somewhere, but it will be effective. We shall preserve this so-called strategic balance.”

Source: Not One More Step: Putin Outlines ‘Red Lines’ Which US & NATO Shouldn’t Cross