Brgenstock: The quadrilateral talks involving Iran, the United States, Pakistan, and Qatar have reached a challenging phase after an offensive message by President Donald Trump. Tehran has stated it will not succumb to threats and emphasized that any future progress rests on Washington's political will and practical commitment to its obligations. An IRNA correspondent reports from Brgenstock, Switzerland. According to Islamic Republic News Agency, the recent developments have caused significant tension among the involved parties. Iran has made it clear that its stance remains firm, and it will not be swayed by external pressures. The focus now shifts to the United States, as Iran insists that Washington must demonstrate tangible actions to move the discussions forward. These talks, which include key international players, were initially aimed at addressing longstanding issues between Iran and the United States. However, the recent turn of events has cast a shadow over the negotiations, raising concerns abou t the possibility of reaching an amicable resolution. The involvement of Pakistan and Qatar was expected to facilitate dialogue and provide a platform for constructive engagement among the nations. However, with the latest developments, the effectiveness of their mediation remains uncertain as the talks enter this complex stage.