Watch: Why is there a 'black cloud' over unity at the Nato summit?

The NATO summit is facing internal friction as discussions on defense spending and controversial geopolitical proposals overshadow unity. BBC correspondent Frank Gardner highlights how these tensions have created a 'black cloud' over the alliance's collaborative efforts.
Why it matters
Internal disagreements within NATO can weaken the alliance's collective security posture and influence global diplomatic stability.
The latest trading of strikes were not the only topic of discussion at the summit, defence spending and Trump's reiteration of his interest in purchasing Greenland were also brought up.
The reporting focuses on the atmosphere of the summit without taking a partisan stance on the specific policy proposals.
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