FRANKFURT — Automaker Volkswagen AG saw profits slip in the second quarter despite taking the global lead in sales over Toyota and GM. The Wolfsburg, Germany-based automaker was hit by 180 million euros ($198 million) in restructuring costs at its MAN truck division. More broadly, it faces headwinds from troubled economies in China, Russia and Brazil. Profit after tax fell to 2.73 billion euros from 3.25 billion euros in the prior-year quarter. Revenues rose 9.9 percent to 56.04 billion euros, largely boosted by favorable exchange rate changes. CEO Martin Winterkorn warned against becoming complacent over the sales lead, saying that “size is not an end in itself.” Volkswagen said Wednesday that earnings from joint ventures with Chinese automakers, booked as equity holdings rather than operating profits, were roughly flat over the first half of the year. China has been a key source of sales growth for Germany car makers but economic growth there has been slowing. VW sales in China fell by 0.5 percent in the first half of the year. The company said that growth in the Chinese auto market had weakened and then turned negative in June. Along with other automakers, Volkswagen faces plunging demand in Russia, where the fall in the ruble has hit consumers hard. Analyst Marc-Rene Tonn of Warburg Research GmbH said that “operationally, it was a good quarter.” He said profit margins were maintained for the company's luxury brand Audi and improved at the core Volkswagen brand, despite still needing improvement. — AP