The talks between Greece and its creditors have been deadlocked since late last week, when Greek Prime Minister Alexis Tsipras rejected as unacceptable a proposal made by the three institutions overseeing the country's bailout the European Central Bank, International Monetary Fund and European Commission. Talks are set to resume but time is running out. A solution is needed by June 30, when Greece's bailout program ends and the remaining 7.2 billion euros ($8.1 billion) in rescue loans will no longer be available. Without the funds, Greece is unlikely to be able to repay its debts and could end up crashing out of the euro. Jitters over Greece's financial future have been a cloud over markets in recent days, notably in Germany where the DAX is down more than 10 percent from its April peak that's the official term for a correction. "Once again, the ongoing uncertainty over Greece continues to weigh on sentiment," said Fawad Razaqzada, an analyst at Forex.com.In Europe, Germany's DAX was down 0.5 percent at 11,143 while the CAC-40 in France was 0.6 percent lower at 4,894. The FTSE 100 index of leading British shares was flat at 6,806. U.S. stocks were poised for a tepid opening with Dow futures and the broader S&P 500 futures down 0.1 percent.One German stock bucking the trend was Deutsche Bank, which saw its share price rise by around 6 percent Monday after the company said its co-CEOs, Anshu Jain and Juergen Fitschen, will step down early. The rise follows Sunday's statement from Germany's biggest bank that Jain will depart at the end of this month while Fitschen will follow next May. Their successor will be British banker John Cryan, initially as co-CEO with Fitschen and then in sole charge. Cryan is currently a member of the company's supervisory board.In addition to Greece, investors are worried about the pace of growth in China, the world's second-largest economy. Figures Monday showed Chinese exports contracting 2.8 percent from a year earlier in May while imports shrank 18.1 percent. China's economy expanded 7 percent in the first quarter, the slowest quarterly growth since the global financial crisis in 2008. The latest data adds to pressure on Beijing to avoid a sharp slump. That helped the Shanghai Composite Index jump 2.2 percent to 5,131.88.Japan's Nikkei 225 closed less than 0.1 percent lower at 20,457.19 and South Korea's Kospi slipped 0.1 percent to 2,065.19. Hong Kong's Hang Seng rose 0.2 percent to 27,316.28. Southeast Asian benchmarks were lower. Australia's stock market was closed for a holiday. Benchmark U.S. crude oil dropped 56 cents to $58.57 a barrel in electronic trading on the New York Mercantile Exchange following OPEC's decision to keep its oil output target on hold. Brent crude, a benchmark for international oil used by many U.S. refineries, fell 29 cents to $63.02 per barrel in London. The dollar slipped to 125.24 yen from 125.61 yen on Friday. The euro strengthened to $1.1181 from $1.1113.