Belfast, Northern Ireland (CNN) Negotiations between the United Kingdom and the European Union on Brexit have "undermined" the Good Friday peace agreement, Irish premier Leo Varadkar said Saturday.

"Brexit has undermined the Good Friday Agreement and is fraying the relationship between Britain and Ireland," Varadkar, known as the Taoiseach, told Irish state broadcaster RTE.

"Anything that pulls the communities apart in Northern Ireland undermines the Good Friday Agreement, and anything that pulls Britain and Ireland apart undermines that relationship," he said.

The Good Friday Agreement, signed in 1998, helped end years of deadly sectarian violence in Northern Ireland.

The terms of the Brexit agreement on the border between Ireland and Northern Ireland remain one of the key sticking points in Britain's ongoing negotiations with the EU ahead of the UK's expected withdrawal from the bloc in March.

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