PARIS/SINGAPORE, July 29 (Reuters) — Chicago wheat edged higher on Wednesday as fresh disruptions to Black Sea grain exports renewed concerns about supplies, after Russia and Ukraine continued attacks on vessels and port infrastructure in the region. The most active wheat contract on the Chicago Board of Trade was up 0.3% at $6.64-1/2 a bushel at 1143 GMT. Read more of the latest ag news here:Concerns over Black Sea exports were reinforced after three major Russian grain terminals restricted truck deliveries, citing heightened shipping risks following recent attacks and changes to grain flows after restrictions in the Sea of Azov. A missile strike also hit the Russian port city of Taganrog, a grain-export hub on the Sea of Azov, underscoring the security risks facing the region's supply chains. Ratings for soybeans fell to 63% from 66%, it said.