Exxon Mobil Corp’s ( XOM.N ) $200 million write-downs last month on abandoned ventures in Russia – once its next big frontier – points to challenges facing Chief Executive Darren Woods in his second year leading the world’s largest publicly traded oil producer. Some of the biggest bets taken by his predecessor Rex Tillerson, now the U.S. secretary of state, have resulted in billions of dollars in write-downs amid falling production and a stock price that has long lagged peers. That leaves Woods facing the prospect of slow growth and billions of dollars in new spending that could weigh on results for years. In 2018, the company plans capital spending of about $24 […]