Now that Nato countries are putting muscle behind their promises on defence, the question over whether this will result in true commitment from the US president continues to hang over the summit, writes Millie Cooke

The US president refused to commit to the alliance’s mutual defence vow, as Washington warns it may shift focus to the threat from China.

Now that Nato countries are putting muscle behind their promises on defence, the question over whether this will result in true commitment from the US president continues to hang…