Iran Vows Countermeasures if US Violates Memorandum of Understanding; Talks Delayed

Iran's Supreme National Security Council issued a statement on June 19, 2026, declaring it would closely monitor the implementation of the Iran-US memorandum of understanding and would take decisive countermeasures if the United States violated its terms.

Simultaneously, the US White House announced on June 18 that Vice President Vance would postpone his planned trip to Geneva for negotiations with Iran. The White House cited complex logistical issues as the reason for the delay, stating that while Vance's negotiating team had been prepared to depart, the decision was made to reschedule. The administration indicated that technical-level negotiations between the two sides had not been finalized, but the US delegation remained ready to proceed once arrangements were confirmed.

According to Lebanese broadcaster Al-Mayadeen, Iran had suspended its participation in the Geneva talks in response to ongoing Israeli military operations in Lebanon. This development highlights escalating regional tensions that are affecting diplomatic efforts between Washington and Tehran. Both sides have indicated their willingness to resume talks once logistical and political conditions are resolved.