By Julie Ingwersen CHICAGO (Reuters) -U.S. wheat futures jumped 6%, hitting a two-week high, and corn rose more than 1% on Monday as Russia’s withdrawal from a Black Sea export agreement raised concerns over global supplies. Soybeans followed the trend, with the most-active January contract setting a one-month top. As of 1:08 p.m. CDT (1808 GMT), Chicago Board of Trade December wheat was up 54 cents at $8.83-1/4 per bushel after reaching $8.93-1/4, the contract’s highest since Oct. 14. Benchmark CBOT wheat futures hit a record high of $13.63-1/2 a bushel in March. CBOT December corn was up 10-…