Our US correspondent Charlotte McDonald-Gibson explains how Warren Buffett's son, Howard, is travelling rural America to drum up support for Ukraine. Plus, Keir Giles, a Russia analyst at the international affairs think tank Chatham House, reacts to the US giving the green light for Ukraine to use western-supplied weapons to strike inside Russia.

The World in 10 is the Times' daily podcast dedicated to global security. Expert analysis of war, diplomatic relations and cyber security from The Times' foreign correspondents and military specialists.

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The billionaire's son rallying support for Ukraine