ROME, ITALY - When France last recalled its ambassador from Italy it was 1940 and Benito Mussolini had just used the opportunity of the Germans marching into Paris to declare war on his northern neighbor.

The backdrop to the withdrawal last week by the Élysée Palace of its ambassador to Rome following months of slurs traded between the country’s leaders, amid disputes over migration policy and Libya, was not accompanied by the thump of artillery shells.

Ambassador’s Recall Unlikely to Be Last Word in Franco-Italian Confrontation

Nonetheless, it has prompted rising fears that the recent public bickering between two of the European Union’s founding members is only just getting started and could spark even more serious retaliatory action.

Ambassador’s Recall Unlikely to Be Last Word in Franco-Italian Confrontation

Some Italian commentators and industrialists have warned the feuding, driven by internal political dynamics on both sides of the Alps, risks boiling over into the economic sphere.

Ambassador’s Recall Unlikely to Be Last Word in Franco-Italian Confrontation

“Given the intricate geopolitical, economic and commercial ties between the two countries, there is no shortage of areas in which the French could make us pay,” Lucio Caracciolo, director of the Limes geopolitical review, wrote recently in an article for Italy’s newspaper.

He added, “France’s retaliatory strikes will be visible only to those who need to see them, fired with a silencer.”

Certainly, the quarrel is unlikely to abate anytime soon, until at least after European parliament elections in May, say analysts.

Neither side has much reason to stop the feuding before then. France’s centrist, cosmopolitan president, Emmanuel Macron, who sees himself as the champion of Europe’s embattled open, liberal order, and a new breed of iconoclastic populist Italians eager to block greater European integration, are locked in a contest to re-shape not only their own countries but also to determine the future trajectory of the European Union.

The immediate cause for the French envoy’s recall by an infuriated Macron was a meeting in Paris between deputy Italian Prime Minister Luigi Di Maio, head of Italy’s anti-establishment Five Star Movement, and luminaries of France’s Yellow Vests (gilets jaunes) movement, the sometimes-violent mass protest which aims to oust Macron. Di Maio offered the Yellow Vests support in organizing their protests - an extraordinary departure from traditional diplomatic norms.

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But the barrage of attacks involving Italy’s populist leaders and Macron has been pushing Franco-Italian relations close to the brink for months.

In June, there was an ugly spat over the closing by Matteo Salvini, Italy’s interior minister and head of the nationalist Lega party, of Italian ports to humanitarian rescue ships carrying migrants from Africa.

Macron scolded the Italian government for “cynicism and irresponsibility,” triggering a tit-for-tat exchange of insults with Salvini, with other ministers on both sides piling on. A spokesman for Macron’s party La Republique en Marche declared, “The position, the line of the Italian government, makes you want to vomit.”

And it has been downhill ever since with flaming disputes over Europe’s budgetary rules.

In a Facebook video last month, Salvini said, “I hope the French will be able to free themselves of a terrible president. The opportunity will come on May 26 (the European elections) when finally the French people will be able to take back control of their future, destiny, (and) pride, which are poorly represented by a character like Macron.”

Until recently, the cross-border arguments over European migration and economic policies and disagreements over what strategies to pursue to stabilize an anarchic Libya featured mainly Salvini and Lega ministers, but with Italy’s M5S sagging badly in opinion polls, Di Maio has now entered the fray, pouring oil on the cross-border political fire.

On Sunday, Di Maio’s party, which is in an unstable coalition government with the Lega, fared poorly in a bellwether regional election in the mountainous Abruzzo. M5S saw its support in Abruzzo halved, taking only a 20 percent share of the vote. Salvini’s surged past its coalition partner, capturing 28 percent.

The Abruzzo vote confirmed that the Lega is now electorally the stronger party in a coalition it entered as the junior partner and is fast eclipsing Di Maio’s party. Even before Sunday, M5S was worried that Salvini might try to implode the coalition government and engineer an early national election in Italy, enabling him possibly to dump Di Maio altogether. Hence, Di Maio wading into the battle with Macron and trying to out-shout Salvini to become the French president’s fiercest Italian critic.