President Donald Trump said Monday that the ceasefire between the United States and Iran remains in danger after Tehran submitted what U.S. officials described as an unacceptable response to ongoing negotiations aimed at reducing regional tensions.

Speaking at the White House, Trump said the ceasefire was “on life support” and warned that the United States could consider further action if diplomatic efforts fail. The comments came amid continued disputes over Iran’s nuclear program, sanctions and security concerns in the Gulf region.

Iranian officials defended their position, saying any agreement must include relief from economic sanctions and guarantees related to the country’s energy exports and regional security interests.

The latest developments raised fears of renewed conflict across the Middle East, where tensions have remained high following recent military incidents and diplomatic disputes involving Iran, Israel and the United States. Oil markets reacted cautiously as investors monitored the situation and the potential impact on global energy supplies.

Despite the sharp rhetoric, indirect talks between the two sides are continuing through international mediators seeking to prevent further escalation.

Sources: Information compiled from reporting by The Washington Post, The Associated Press, BBC News and CNN.