Bargaining includes threats of force and shaping institutions. [definitional]
But, in general, this becomes a wide-open bargaining problem. It is even wider open than the present formulation suggests, since the players may not only manipulate values of R and B but of course can now threaten direct attack, or operate on the institutional arrangements that determine the values of the A’s.
Thomas C. Schelling, The Strategy of Conflict, loc. 515