What navies could do about an incoming asteroid

How would NATO navies respond to a four-mile nickel-iron asteroid on an Earth-impact course with one year of warning?

The panel suggests nuclear detonations to deflect the asteroid, but does not establish how NATO navies would launch or carry out the interception.

The suggested response is to use nuclear detonations to change the asteroid's course. With a year of warning, the discussion proposes a small angular deflection that would make it miss Earth or pass through a different encounter with the Moon. A roughly half-degree change is offered as a rough idea, without an orbital calculation. The exchange does not identify a naval launch platform or work through an interception plan.