War in the Middle East pushed the yen to the brink of multi-decade lows and prompted the government to prop it up -- a peace deal, however, won't pull it back from the precipice. Stocks and bonds soared on Monday on news of the planned Iran-U.S. halt to a war that has inflamed global inflation expectations, particularly in energy importers like Japan. But the yen barely budged, holding above the 160 per dollar level that invited official intervention just last month.