It's not the only problem, but certainly it is a major problem.

a good effort to try to bridge the remaining differences, which I believe are difficult but certainly not insurmountable.

Everybody has got an interest in solving this problem through diplomatic means. ... There will be a point at which we look at the deadline, but we are not at that point yet,

did not make a lot of progress.

simply not on the table.

I can't say at this point how it's going to end up, ... difficult but not insurmountable.