US STOCKS-Wall Street ends down on heightened Russia concerns
* Russia sanctions, geopolitical concerns weigh on Wall St
* Aetna, other health insurers fall after Goldman note
* Jobless claims fall unexpectedly in latest week
* Indexes off: Dow 0.5 pct, S&P 0.6 pct, Nasdaq 0.5 pct (Updates to close, changes prices and comment)
By Akane Otani
NEW YORK, Aug 7 (Reuters) - U.S. stocks ended lower on Thursday, continuing a recent streak of weakness as Russia's surprisingly harsh retaliatory measures in response to Western sanctions raised concerns about global growth.
In addition to Moscow's ban on imports of many Western foods, following sanctions imposed for Russia's support of rebels in eastern Ukraine, investors worried that the conflict between Russian and Ukraine is escalating, with the downing of a Ukrainian fighter jet. .
The declines briefly dragged the Dow below its 200-day moving average in afternoon trading. The S&P 500 is now nearly 4 percent below the record closing high it set last month
While the full extent of the sanctions are still unknown, escalating tensions in Russia could continue to spur selling in stocks, analysts said. Continuación...