British Prime Minister Theresa May appealed directly to fellow European Union leaders on Wednesday to drop "unacceptable" Brexit demands that she said could rip Britain apart, urging the bloc to respond in kind to her "serious and workable" plan.

They listened politely for a few minutes but said afterward that a stalemate on the Irish border was unbroken — though some EU diplomats detected a cracking of ice around the spectacular summit dinner table, laid in the Salzburg theater used to film a dramatic escape finale in the film "The Sound of Music."

Earlier, EU officials insisted May has to give more ground.