Tensions spike as Iran formally refuses to join a second round of talks, derailing diplomatic efforts and putting planned negotiations in Pakistan on hold. The rejection undercuts outreach led by JD Vance and intensifies pressure on Donald Trump, who has doubled down with hardline rhetoric and renewed military threats. With the ceasefire window narrowing, Washington signals readiness to escalate if diplomacy collapses, while Tehran maintains defiance and rejects what it views as coercive negotiations.