The European Union accused the United States on Tuesday of prolonging "market uncertainty" with its decision to hold off on imposing controversial tariffs on metal imports from key global trading partners.
The 25 percent tariffs on steel and 10 percent duties on aluminium -- a key tenet of US President Donald Trump's "America first" approach to worldwide trade -- were due to go into effect on Tuesday.
But after renewed fears of a trade war spooked Wall Street, Trump said he was holding off the levies, offering a 30-day reprieve to Canada, Mexico and the EU.
The European Union, Germany and France all called for EU nations to be permanently excluded from the punishing tariffs.
"The US decision prolongs market uncertainty, which is already affecting business decisions," the European Commission, the bloc's executive arm, said in a statement.
European Parliament president Antonio Tajani tweeted: "We expect EU to be exempted from duties once and for all. We play by the rules - let's work together to isolate those who don't."
Europe -- which last year exported over $7.7 billion of steel and aluminium to the US market -- had lined up its own punitive tariffs on American imports, including iconic items like Harley-Davidson motorbikes, blue jeans and bourbon whiskey.
Britain, the EU's second-largest economy, welcomed Trump's "positive" decision but warned against further protectionist measures from the White House.
Trump on Monday said the "necessary and appropriate means to address the threat to the national security" posed by the metal imports is to "continue these discussions and to extend the temporary exemption of these countries."
The US also announced it had finalised a trade deal with South Korea, which includes several concessions made by Seoul, including extended tariffs on pick-up trucks and a quota on its steel exports.
Washington has "agreements in principle" with Argentina, Australia and Brazil, "the details of which will be finalised shortly," a White House statement said.
"In all of these negotiations, the administration is focused on quotas that will restrain imports, prevent transhipment, and protect the national security."
The Trump administration has told trading partners they must make concessions, but the EU has insisted it will not negotiate without first obtaining a permanent exemption.
Extensions for Canada and Mexico had been expected, as Mexico City, Ottawa and Washington work on revamping the North American Free Trade Agreement.
Canada exported over $12 billion of steel and aluminium to the United States in 2017, with another $3 billion from Mexico.
But an extension for the EU was less of a foregone conclusion.
- 'Won't negotiate under threat' -
The EU's three largest economies -- Britain, France and Germany -- held crisis talks on Sunday and the French presidency said afterwards they had agreed "the EU must be ready to act" if Washington presses ahead with the tariffs.
"We agree that there is a problem of excess capacity in the steel and aluminium sector.We are ready to work with the United States and other partners to find quick and appropriate solutions," France's Foreign Minister Jean-Yves Le Drian and Finance Minister Bruno Le Maire said in a statement.
"But we can only do that calmly when we are certain of being permanently exempted from the threat of unilateral tariff increases."
Axel Eggert, Director General of the European Steel Association (EUROFER), said Tuesday the month-long exemption was "welcome, if temporary."
"Despite all the evidence of the harm to the EU-US relationship - and to our respective economies - the Administration has opted to continue a policy of uncertainty in its international trade practice," he said.
In a strident statement, the European Commission said it was willing to continue dialogue but pointedly warned: "We will not negotiate under threat."
"Any future transatlantic work programme has to be balanced and mutually beneficial," it said.
London's benchmark FTSE 100 index added 0.1 percent to stand at 7,512.94 points at Tuesday's opening, amid May Day holiday closures in Frankfurt and Paris.