cul de sac, standstill, deadlock, stalemate, dead end, blind alley, dead-end street, cul-de-sac, dead-end, deadend, more...

breakthrough, breakthroughs

stalemate, deadlock, logjam, standoff, tie, more...

political, present, current, apparent, complete, constitutional, therapeutic, diplomatic, economic, theoretical, logical

mediator's problem,   nothing can be done,   stalemate position,   stuck place,   nothing we can do,   reach a dead end