Ironically, the two sides have reached a deadlock about what set of rules to refer to when they reach a deadlock.

讽刺的是，陷入僵局的原因是双方在僵持不下时应参照哪种规则产生了分歧。

The last round of peace talks in Geneva reached a deadlock in April when the main opposition group suspended its participation because of the mounting violence.

因叙境内暴力冲突不断，叙主要反对派暂停参加和谈，4月新一轮日内瓦和谈陷入僵局。