The 5+1 reminds me of Iran's negotiations with Iraq before Iraq attacking Kuwait. They met, they talked but nothing came out. Then Iraq attacked Kuwait and out of sudden "There was a will" on Iraqi side. They released our POWs over night almost. I remember that night I was camping with my high school in Golestan Forest in Gorgan. Our bus driver came to tell us and our teachers that "The dude said to come and to take your boys home". We were so happy three of us had fathers who were POWs then.
I do not know what is needed for a will to exist this time though.