Talks between Doha and Riyadh to resolve a two-year regional spat have stalled, Qatar's foreign minister said, after a flurry of diplomacy late last year raised hopes the damaging rift was being healed. "We have always been very open for dialogue, since the start of the Gulf Cooperation Council (regional bloc) crisis," Qatar's Foreign Minister Mohammed bin Abdulrahman Al-Thani said at the Munich Security Conference on Saturday.