Iranian chief negotiator Mohammad Bagher Ghalibaf accused the United States on Wednesday of actively seeking to reignite the Middle East war.
Ghalibaf warned that any renewed American aggression would provoke a forceful response expanding far beyond the boundaries of the region.
This warning followed statements from United States President Donald Trump, who threatened military action unless Tehran signs a peace deal.
Despite his strict ultimatums, Trump claimed Washington is in the final stages of delicate diplomacy to prevent further casualties.
The joint United States and Israeli conflict with Iran halted under a fragile, Pakistani-mediated ceasefire initially struck on April 8.
The ongoing war of words has severely impacted global markets due to the strategic closure of the vital Strait of Hormuz.
Iran maintains a strict chokehold on the waterway, paralyzing a fifth of the global supply of oil and liquefied natural gas.
The economic fallout has triggered deadly protests across energy-dependent African nations, resulting in civilian casualties and widespread public transport standstills.
The United Nations warned of a severe agrifood shock as the blockade continuously blocks a third of global fertilizer shipments.
Meanwhile, Israel placed its military forces on the highest alert level, prepared to launch immediate operations if diplomatic efforts fail.