US Launches Next Round of Russian Sanctions

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Head of Russian oil giant Rosneft added to sanctions list. As the shares in the company fall, will the Kremlin get the message? Also in the programme, the biggest ever takeover in the pharmaceuticals industry - US drug giant Pfizer offers 100 billion dollars for rival company AstraZeneca. Plus, plans for a sustainable spaceship to carry humans away from a dying Earth? No, it is not science fiction. We speak to a researcher involved in the project.