Bulletin world briefing: Why Russian soldiers are surviving just 20 minutes on the frontline

1. Half a million Russian troops killed in Ukraine war as drones cause havoc
2. Venezuela earthquake death toll exceeds 1,700 as desperate search goes on
3. Why exiled Chinese billionaire Guo Wengui was jailed by the US for 30 years
4. Russia accused of ‘crazy new step’ after arming civilian ship with machine guns
5. Suspected saltwater crocodile kills dog 660km inland in rare Australian attack

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