Ukraine, Greece keep markets nervous

Dollar surges again on international tensions as traders wonder about Black Sea grain flows.

Grain futures are mixed in fairly quiet trading overnight, with the latest international news causing two-sided trade. Greek elections roiled currency markets again, sending the dollar to new highs briefly, while new fighting threatened a major port in Ukraine, a leading exporter of corn and fertilizer. Dry conditions on the central and northern Plains provided support for the beleaguered wheat market.

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