US STOCKS-Wall St to fall at open as Ukraine tension continues
* Producer prices fall in February
* UMich consumer sentiment data on tap
* General Mills falls after outlook
* Aeropostale drops after earnings
* Futures off: Dow 39 pts, S&P 3.5 pts, Nasdaq 4.25 pts
By Chuck Mikolajczak
NEW YORK, March 14 (Reuters) - U.S. stocks were poised to open lower on Friday, putting the S&P 500 on track for a second consecutive fall after suffering its biggest decline since early February, as tensions in Ukraine continued to unnerve investors.
* Equities tumbled on Thursday on rising concerns over Ukraine and Russia and new signs of an economic slowdown in China.
* U.S. Secretary of State John Kerry will seek assurances from Russia on Friday that it will not seek to annex Crimea and will address concerns over Ukraine through negotiation, a senior State Department official said before talks in London. Continuación...