The atmosphere here at the NATO summit has been little short of obsequious towards President Trump. Leaders have worked out that if they want US buy-in to NATO they have to commit to Trump’s spending demands, and flatter him into believing he is the only person who can make things happen.

Well, so far it seems to be working. The US has renewed its commitment to defending other NATO countries. And the language has been expletive free.

But why are NATO leaders refusing to mention Russian aggression? Will they just end up looking scared? We talk to Estonia's defence secretary and the global historian, Peter Frankopan, author of Silk Roads

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