NEW YORK, March 30 : The euro fell against the dollar on Monday on concerns about the growth impact from an extended U.S.-Israeli war with Iran, while the yen was supported after Japanese officials stepped up currency intervention threats. Iran described U.S. proposals to end a month of war in the Middle East as "unrealistic, illogical and excessive" on Monday and unleashed more missiles on Israel, as oil prices rose further after Yemen's Houthis entered the conflict. Rising oil prices have