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The war in Ukraine has shown how fast the technology of combat is changing and on Thursday the prince saw a hydrogen-powered drone, on a visit to designers in Estonia's capital Tallinn.

Tallinn also just announced it will spend 5% of GDP on defence from next year.

The visit begins on Thursday morning with a meeting with Estonia's President, Alar Karis, in Tallinn, followed by a visit to a school teaching refugees from the war in Ukraine.

A minute's silence was held before the ISU Figure Skating Championships in Tallinn, Estonia on Thursday as a mark of respect for those involved in the crash.

Not far from the Estonian capital, Tallinn, at the tip of the railway, dozens of workers are welding and hammering away at the new Ülemiste passenger terminal.