Key Takeaways:Walmart has sold its stake in JD.com at a time when its Chinese operations are flying on a growing local preference for Costco-style warehouse shoppingJD.com continues to face stiff competition in China’s tough e-commerce market as consumption in the country remains sluggishBy Xiao Lin There are no eternal allies or enemies, just a constant shifting of alliances, British statesman Henry John Temple said over a century ago when he famously proclaimed: “Our interests are eternal and perpetual, and those interests it is our duty to follow.” Such perspective seems especially relevant…