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The "nuclear option" seems far-fetched, but with Trump failing to rule out military action it has to be considered.

With political challenges pushing his back against the wall, Yoon went for the nuclear option - a move that few, if any, could have predicted.

The nuclear option would be to leave him out, possibly sending a clear message to the dressing room that no-one is safe.

The group has produced a 60-page booklet called The Nuclear Option.

Intelligence showed Putin soon backing away from the nuclear option, though Woodward notes that one reason may have been the fact that, over the next few months, the battlefield stabilized—Russia no longer faced the threat of a dreadful defeat.