There is no diplomatic initiative these days. After the failures of the Vatican in November 2016 and the failure of the negotiations in Santo Domingo in 2017, I think practically everybody in the international community knows that any dialogue process will have one outcome: Maduro will remain in power. That is their only objective. For any dialogue or any negotiation process, the only acceptable solution for them is to remain in power. That makes it very difficult for anybody to volunteer in a new dialogue or in a new negotiation.
On December 3rd, 2018. See this statement in context.