The European Union¡¯s refusal to renegotiate the Brexit deal governing Northern Ireland has put the bloc on a fresh collision course with the U.K., as Boris Johnson¡¯s government warns it will suspend parts of the agreement if the EU doesn¡¯t budge.

David Frost, the U.K. minister for EU affairs, on Wednesday called on the bloc to rip and substantially rewrite the controversial Northern Ireland Protocol, the part of the U.K.¡¯s separation agreement that governs trade and market rules for the region. The EU declined.

¡°Respecting international legal obligations is of paramount importance,¡± European Commission Vice President Maros Sefcovic said in a statement on Wednesday. ¡°We will not agree to a renegotiation.¡±