DUBAI, United Arab Emirates (AP) — The U.N. decision to revoke Iran’s invitation to this week’s Syrian peace talks almost as quickly as it came was a reminder that the path to reconciliation between Tehran and the West is hardly a smooth one. Progress on the issue of Iran’s nuclear program is no guarantee of an easing of tensions in the multiple disputes between the two sides.

Iran took a major step in defrosting relations with the West over its nuclear program by halting high-level uranium enrichment Monday as part of a landmark interim deal that wins it an easing of some economic sanctions.