Markets open the week with losses as oil prices decline and share prices dip following a shift in U.S. posture toward Iran. Multiple outlets report that the United States backs away from earlier plans that raised the prospect of military action, and instead says it has returned to a process of peace talks with Iran. The change in tone comes through statements indicating both countries are once again engaged in negotiations. As a result, investors appear to scale back the risk premium associated with potential conflict in the Middle East, contributing to weaker oil prices at the start of the week. Alongside the fall in crude, equities in Australia also move lower, reflecting a broader risk-off response to developing geopolitical signals. The reports characterize the market reaction as tied directly to the revised U.S. approach and the claim that diplomacy is underway. No specific timeline for the negotiations or details of any agreement are included in the provided coverage.