Donald Trump has announced helium volition enforce a 30% tariff connected imports from the European Union from 1 August.
The tariffs could marque everything from French food and Italian leather goods to German electronics and Spanish pharmaceuticals much costly successful the US.
Mr Trump has besides imposed a 30% tariff connected goods from Mexico, according to a station from his Truth Social account.
Announcing the moves successful abstracted letters posted connected his account, the president said the US commercialized shortage was a nationalist information threat.
In his missive to the EU, helium wrote: "We person had years to sermon our trading narration with The European Union, and we person concluded we indispensable determination distant from these long-term, large, and persistent, commercialized Deficits, engendered by your tariff, and non-Tariff, policies, and commercialized barriers.
"Our narration has been, unfortunately, acold from reciprocal."
In his missive to Mexico, Mr Trump said helium did not deliberation the state had done capable to halt the US from turning into a "narco-trafficking playground".
The president of the European Commission, Ursula von der Leyen, said the EU could follow "proportionate countermeasures" if the US proceeds with imposing the 30% tariff.
Ms von der Leyen, who heads the EU's enforcement arm, said successful a connection that the bloc remained acceptable "to proceed moving towards an statement by Aug 1".
"Few economies successful the satellite lucifer the European Union's level of openness and adherence to just trading practices," she added.
"We volition instrumentality each indispensable steps to safeguard EU interests, including the adoption of proportionate countermeasures if required."
'Very concerning'
Ms von der Leyen has besides said imposing tariffs connected EU exports would "disrupt indispensable transatlantic proviso chains".
Meanwhile, Dutch Prime Minister Dick Schoof said connected the X societal media level that Mr Trump's announcement was "very concerning and not the mode forward".
He added: "The European Commission tin number connected our afloat support. As the EU we indispensable stay agreed and resolute successful pursuing an result with the United States that is mutually beneficial."
Mexico's system ministry said a bilateral moving radical aims to scope an alternate to the 30% US tariffs earlier they are owed to instrumentality effect.
The state was informed by the US that it would person a missive astir the tariffs, the ministry's connection said, adding that Mexico was negotiating.
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Trump's tariff threats and delays
On his so-called "liberation day" in April, Mr Trump unleashed "reciprocal tariffs" connected galore of America's commercialized partners.
The US president said helium was targeting countries with which America had a commercialized imbalance.
However, since past helium has backed down successful a spiralling tit-for-tat tariff face-off with China, and struck a woody with the UK.
The US imposed a 20% tariff connected imported goods from the EU successful April but it was aboriginal paused and the bloc has since been paying a baseline tariff of 10% connected goods it exports to the US.
In May, portion the US and EU wherever holding commercialized negotiations, Mr Trump threated to enforce a 50% tariff connected the bloc arsenic talks didn't advancement arsenic helium would person liked.
However, helium aboriginal announced helium was delaying the imposition of that tariff portion negotiations implicit a commercialized woody took place.
Earlier this week, the EU's enforcement commission, which handles commercialized issues for the bloc's 27-member nations, said its leaders were inactive hoping to onslaught a commercialized woody with the Trump administration.
Without one, the EU said it was prepared to retaliate with tariffs connected hundreds of American products, ranging from beef and car parts to brew and Boeing aeroplanes.