Why Baltic air defence needs more than two Type 45 destroyers

How many Type 45 destroyers would be needed to defend Baltic airspace?

Two might cover a simple rotation, but a serious commitment would require more ships so the force could absorb heavy air attack and rotate with full missile magazines.

Two Type 45s could provide a basic rotation, but the scale of a possible air attack makes that an inadequate measure of the force required. Ships would need to rotate with fully stocked vertical-launch systems. The demand for fresh missile magazines therefore increases the number of ships needed beyond a simple alternating pair. No firm total is given.