Norway

The American request, confirmed in a statement from the commanding officer of Marine forces in Europe, comes as tensions between the US and Russia are increasing amid the humanitarian disaster in Syria and US assertions of Russian involvement in cyber hacks on American political organizations and individuals.

A social media campaign had proposed giving Halti mountain summit to Finland for its 100th birthday next year.

The border between the two countries runs up the mountain near its peak.

But Norwegian Prime Minister Erna Solberg said that sadly she had had to turn down the idea because the country's constitution prohibited any sacrifice of Norwegian territory.

Part of Halti mountain is already in Finland - and forms its current highest point - but the peak is 20m (66ft) across the border inside Norwegian territory.