New Delhi, June 6 -- A senior adviser to Iran's supreme leader has said negotiations between Tehran and Washington have reached a deadlock over $24 billion in frozen Iranian assets, warning that any return to war could trigger a broader regional conflict stretching beyond the Persian Gulf.

Speaking with CNN, Mohsen Rezaei said the Trump administration must take the next step if it wants to secure a peace agreement with Iran.

"The negotiations are at a deadlock and Trump must break this deadlock," Rezaei said.

"The ball is in Trump's court."

According to Rezaei, Tehran wants the United States to unfreeze $24 billion in Iranian assets as part of a trust-building process.

Iran reportedly seeks the release of $12 billion immediately afte...