GETTY Polish PM Beata Szydło is involved in a row with the EU over the re-election of Donald Tusk

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Warsaw continued its recent bitter war of words with eurocrats as it threatened to veto the proposed Rome Declaration, which is meant to pave the way forward for the project after Brexit. Prime minister Beata Szydło said she would not hesitate to vote down the document if it does not match Poland’s priorities as her country takes an increasingly hard line towards European integration.

Such a move would spark pandemonium amongst other member states at what is supposed to be a carefully choreographed and painstakingly stage-managed display of unity during the bloc’s darkest hours. Eurocrats have repeatedly talked up the summit in Rome, to be held on March 25, saying it will be a display of “solidarity” between the remaining member states and a “birth certificate for the EU at 27”.

GETTY Warsaw is also at loggerheads with Germany over plans for a two-speed Europe

GETTY Francois Hollande got involved in a heated row with the Polish PM at this month's EU summit

But those plans now appear to be in disarray amid a brutal and escalating diplomatic crisis with Warsaw, which has been infuriated by the re-election of Donald Tusk as EU Council president. After the decision was made in Brussels earlier this month Polish ministers issued a series of extraordinary attacks on their fellow member states and vowed to take revenge by blocking future EU initiatives. And now it appears they have the much-vaunted Rome Declaration, which is legally of no consequence but which could not be more symbolically important to Brussels, firmly in their sights.

Ms Szydło said: “If the declaration does not include the issues which are priorities for Poland, we will not accept the declaration. “The unity of the European Union, defence of a tight NATO cooperation, strengthening the role of national governments and the rules of the common market which cannot divide but unite – these are the four priorities which have to be included in the dec Her open threat will provoke fury in Europe’s other capitals where for some senior leaders patience with Warsaw’s political grandstanding is growing increasingly thin.

The best pictures from EU Summit 2017 Fri, March 10, 2017 EU leaders will gather for a two-day summit to discuss a number of issues including Great Britain's exit from the Union Play slideshow AFP/Getty Images 1 of 18 Hollande and Merkel on the second day of a European Summit