Turkey has warned the EU that millions more refugees could flee Syria as the civil war intensifies there, European Council President Donald Tusk says.
Islamic State claims attacks in the Yemeni city of Aden - including one on a hotel used by the prime minister - that killed 15 Gulf and Yemeni troops.
Nato Secretary-General Jens Stoltenberg says Russia's violation of Turkish airspace over the weekend "does not look like an accident".
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