European leaders are meeting to work out how they can talk Donald Trump down from attempting to force the sale of Greenland. 

The US President's announced increasing tariffs starting next month, against six European countries, the UK and Norway, unless he gets a purchase deal. 

Observer Foreign Editor Andrew Rettman told Mike Hosking that Trump is known for flip-flopping on decisions, so leaders are working out if there's wiggle room. 

He says there's still hope this is just Trump's crazy way of negotiating. 

But Rettman says others are concerned a trade war could just be American soft power - with greater force to come. 

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