BRUSSELS, SEPTEMBER 2 - The European Commission reiterates "the willingness to work constructively with the United Kingdom and is ready to analyze concrete proposals" backstop alternatives "as long as they are compatible with the divorce agreement" which has already been negotiated. Proposals that have not yet arrived from London. Thus the spokeswoman of the Community Executive Mina Andreeva to the questions of journalists, confirming that the negotiations at the technical level continue.