It's called 'the British betrayal' - Great Britain promised Brexit wouldn't lead to the creation of a new border between the UK and Northern Ireland. It broke that promise. Now the province's Loyalists, welded to the union with Great Britain, are feeling abandoned.

As China celebrates its Communist Party's centenary, relations between the world's two superpowers are in dire straits. With special access inside China we explore the deeper forces pushing US-Sino relations to the brink.