David and Helen talk to Shashank Joshi, defence editor at the Economist, about what Vladimir Putin hopes to get out of the Ukraine crisis and what anyone can do to stop him. Is some sort of invasion inevitable? Is Russia’s goal to sow dissent or to achieve regime change? What leverage does the rest of world have over Putin and his allies? And at the end of the episode, David announces that the podcast will come to an end in March, after six years.