Eight European Union member states issued on Tuesday their starkest warning ahead of the publication of U.S. President Donald Trump's long-awaited Middle East peace plan.

The joint statement by France, the Netherlands, Poland, Sweden, the United Kingdom, Belgium, Germany and Italy follows a United Nations Security Council session on the situation in the region during which outgoing U.S. Ambassador Nikki Haley praised the "thoughtful" plan.

The EU states, all members of the Security Council, warned that any peace plan that would disregard "internationally agreed parameters," namely a two-state solution based on the 1967 borders with Jerusalem as the capital of both states, "would risk being condemned to failure."

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They also reiterated "the EU's strong continued commitment to the internationally agreed parameters for a just and lasting peace in the Middle East based on international law, relevant UN resolutions and previous agreements."

The statement went on to read: "The EU is truly convinced that the achievement of a two-state solution based on the 1967 borders with Jerusalem as the capital of both States, that meets Israeli and Palestinian security needs and Palestinian aspirations for statehood and sovereignty, ends the occupation and resolves all final status issues, in accordance with Security Council Resolution 2334 and previous agreements, is the only viable and realistic way to end the conflict and to achieve just and lasting peace."

The member states added that the EU "will continue to work towards that end with both parties, and its regional and international partners", and called for restring "a political horizon" on this issue.

Nikki Haley said earlier Tuesday that the proposed U.S. plan to broker peace between Israel and the Palestinians "brings new elements to the discussion, taking advantage of the new world of technology that we live in." However, she gave no details of what was in the plan.