CBOT grain futures closed higher across the board on Monday, with September wheat surging 11.75 cents, or 1.84 percent, to settle at 6.5100 dollars per bushel, driven by concerns that escalating fighting between Russia and Ukraine could disrupt exports from the Black Sea region. December corn rose 8.50 cents, or 1.83 percent, to close at 4.7250 dollars per bushel, while November soybeans added 4.75 cents, or 0.40 percent, to end at 11.9225 dollars per bushel, supported by worries over US growing conditions and news of fresh soybean export sales totaling 488,000 metric tons to China and another 136,150 metric tons to unknown destinations. However, falling crude oil prices and rains in parts of the US Midwest pressured corn and soybeans for much of the trading session.