Iran dismisses new U.S. sanctions threats as desperate, asserting they will fail to undermine Tehran's resilience and power.

Iran has rejected Washington's threat of what it calls the toughest sanctions in history. The exchange adds to regional strain as ceasefire efforts, oil flows and diplomacy remain under pressure.

Iranian Foreign Minister Abbas Araghchi said Washington must speak to Iran respectfully to find "a solution based on justice and honour".

Iran has dismissed the threat of new US sanctions as desperate, saying the measures will fail to defeat Tehran.

Iran has dismissed the threat of new US sanctions as desperate, saying the measures will fail to defeat Tehran.

HOUSTON, Aug 21 : International and U.S. crude futures rose on Friday after U.S. President Donald Trump threatened economic sanctions on Iran's trading partners, raising expectations of tighter supply in the coming weeks.International benchmark Brent crude futures rose 8 cents, or 0.09 per cent, to $9