Japan is ready to respond "resolutely" to volatile yen movements, Finance Minister Shunichi Suzuki warned Monday, but the currency weakened to breach the key 145 mark versus the U.S. dollar, a level unseen since the country's market intervention in late September.Japan's record 2.84 trillion yen ($19 billion) intervention to support the yen on Sept. 22 served as "a warning" to speculators who were behind the currency's recent rapid, one-sided movements, Suzuki said, adding the government is watching developments "with a sense of heightened vigilance."Market analysts say the effect of the ye…READ FULL ARTICLE