Bulletin world briefing: Nato vows to defend its territory after Russian missile explodes in Poland

The Independent

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1. Nato pledges to defend its territory after Russian missile explodes in Poland
2. First human volunteer vaccinated against Bundibugyo strain of Ebola
3. Egypt confirms drone attack caused fire on gas tankers near Suez Canal
4. Tourists run out of food and water as cruise ship stranded on Danube
5. How Prague Zoo is keeping its polar bears cool amid scorching heat

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