From: DMcG - PM
Date: 27 Nov 17 - 05:02 AM
One way would to declare we will not impose any restriction that requires a hard border. You may or may not be prepared to do that, but is perfectly possible. So there is at least one way to progress the talks that the UK could propose that would gwt the talks through the nexr hurdle.

Great, then we finally get to the end deal, and EU & UK start imposing tariffs on each others goods. Either party would be able to get around those tariffs by shipping via The Republic of Ireland.

Article 50 says that nothing can be agreed until everything is agreed.