If you are in business you should also be aware of non-market strategy and geopolitics.
One of the world best energy and geopolitics experts is Daniel Yergin. His books are amazing. The Prize (winner of the Pulitzer prize) and the recent one, The New Map are highly recommended.
Other relevant geopolitics analysts are Ian Bremmer, Fareed Zakaria,Peter Zeihan
Magazines and newspapers
Foreign Affairs Magazine, Foreign Policy, Project Syndicate, The Atlantic, The Economist, Financial Times, The New York Times, The Wall Street Journal
Books about the recent events
Putin’s World, by Angela Stent
Putin’s People by Catherine Belton
Freezing Order by Bill Browder