"Maybe we will have a deal, or maybe not," says senior EU official, who adds that when Brexit is on the agenda "we should expect the unexpected"
Source: "We were told in 2018 by the UK government that the ratification takes six months; In the beginning of 2019 we were told it takes six weeks and the latest is that a few days is more than enough. So we will see."
Attending his first EU summit, Johnson will have the chance to address EU leaders - as May did before him. We don't know if he will.
But even if there is a deal, not certain enough time to ratify it.
"Even if a deal is struck in the comings days finalising the deal may be impossible."
EU thinks ratification doable on their side, less clear on London.