NEW YORK, July 7 : The dollar advanced on Tuesday, following two straight sessions of slight declines, while the yen held near a four-decade low, as investors continued to watch for signs of possible intervention by Japanese authorities to support the currency.The greenback showed little reaction to reports that Iran fired missiles at ships in the Strait of Hormuz overnight, which sources said left a Qatari LNG tanker at risk of exploding and a Saudi-flagged crude oil tanker damaged in the waterway. U.S. crude rose 1.4 per cent to $69.51 a barrel and Brent rose to $73.05 per barrel, up 1.46 per cent on the day on renewed concerns over supply disruptions. "Ceasefires, by their very nature, fray, but it doesn't mean that they're over. And I think that neither the U.S. nor Iran are looking to