While warding might disrupt things, logical NPC reactions should be there. A
lieutenant is not going to sit in a tavern swilling beer while a mage attempts
to sieze control of his liege's province. Nor will NPC nobles. The PC might
have to deal with a Great Captain once the warding is gone, but one does not
need to give orders to defend against an invader or raise levies to do so.
Try everything possible to communicate with one's superiors, yes, but don't
just sit there.
For example, I've ruled IMC that only individual PCs can command their armies
and fleets in the absence of a negotiated treaty. If a player isn't present,
his armies will defend--but not attack. NPCs will rush troops to meet a
border crossing--but won't cross the border themselves.