By Supantha Mukherjee and Marie Mannes STOCKHOLM (Reuters) -H&M, the world’s second-biggest fashion retailer, said on Monday it had decided to wind down its business in Russia, joining a growing list of companies fully exiting the country. The company suspended its business in Russia in early March in the wake of Western sanctions against Moscow following its invasion of Ukraine. Russia was H&M’s sixth-biggest market and the company was increasing its store count there while reducing physical stores in many other markets. “After careful consideration, we see it as impossible given the current …