EU member states have approved a raft of tariffs targeting US goods including whiskey and motorcycles in retaliation against duties imposed by US President Donald Trump on European metals.

The move fuels a growing transatlantic trade war just days after a disastrous G7 summit in Canada at which Mr Trump lambasted his allies on the issue and refused to adopt a joint statement.

The European countermeasures aimed at €2.8bn ($3.3bn) of American imports come after Mr Trump followed through on his threat to impose tariffs on European steel and aluminium exports at the start of June.

"Member states have unanimously supported the commission's plan for the adoption of rebalancing measures on the US tariffs on steel and aluminium," a European Commission source told AFP on condition of anonymity.

The source added that the EU tariffs would take effect "in coming days", with other officials saying they would be implemented by the beginning of July. 

Brussels first drew up the list in March when Mr Trump initially floated the 25% tariffs on steel imports and 10% on aluminium, which also target Canada, Mexico and other close allies.

From blue jeans to motorbikes and whiskey, the EU's hit-list of products targeted for tariffs with the US reads like a catalogue of emblematic American exports.

The list does not specifically name brands but European Commission chief Jean-Claude Juncker spelled out in March that the bloc was "preparing import duties for US products including Harley-Davidson, bourbon and Levi's jeans."

The EU imported €415m worth from the US in 2017, along with another €150m worth of whiskey without the "bourbon" designation.

Cranberries, cranberry juice, orange juice, sweetcorn and peanut butter are among the other food products targeted.

The list hits clothing including "trousers and breeches of cotton denim" along with bed linen and men's leather footwear, eye make-up and lipsticks, and a host of steel products.

"The EU will exercise its rights on US products valued at up to €2.8bn of trade, as notified to the WTO (World Trade Organisation)," the commission source added.

Transatlantic ties are at their lowest level for many years due to rows over a host of issues including the tariffs, the Paris climate agreement, the Iran nuclear deal and the new US embassy in Jerusalem.

But relations plumbed new depths at the weekend as Mr Trump abruptly rejected the text of a G7 statement and bitterly insulted his Canadian host, Prime Minister Justin Trudeau.

Mr Trump claimed America had been obliged to levy the metals tariffs as it has been exploited as the world's "piggy bank" under existing arrangements.

His counterparts, however, said they were equally determined to protect "rules-based" international trade.

The European Commission has also launched a legal challenge against the US tariffs at the WTO.

In addition, it is assessing the need for measures to prevent a surge of imports of steel and aluminium into Europe as non-EU exporters divert product initially bound for the US.