New Delhi, June 29 -- A fragile US-Iran interim agreement aimed at preventing a wider regional war is facing its biggest test yet, with both Washington and Tehran accusing each other of violating Article 5 - the section governing commercial shipping through the strategically vital Strait of Hormuz.

The dispute over who controls one of the world's busiest maritime chokepoints has triggered a fresh cycle of military strikes, threatening to derail the June 17 Memorandum of Understanding (MoU).

Article 5 of the interim US-Iran MoU focuses on restoring safe commercial navigation through the Strait of Hormuz after months of conflict.

Under the agreement, Iran committed to:

-Ensure the safe passage of commercial vessels through the Strait of...