* Drone in Moscow, reported attack near Crimea highlight war risks

* Dry U.S. weather forecast lifts CBOT soybeans

* Corn also trades higher, after hitting 2020 low this week

CHICAGO, Aug 18 (Reuters) - Chicago Board of Trade wheat futures rose 3% on Friday as a drone attack on Moscow and a reported Ukrainian sea strike near Crimea revived concerns over war disruptions to Black Sea grain exports, analysts said.

Soybean futures advanced for a third session to reach a July high as a dry, warm weather forecast for the U.S. Midwest fueled worries about crop stress. Corn also traded higher.

A Ukrainian drone damaged a building in central Moscow on Friday, Russian officials said, while on Thursday two Russian war ships repelled a Ukrainian attack with an unmanned boat near Crimea, the Russian defence ministry said.

Grain traders have been nervous that escalating tensions between Russia and Ukraine could disrupt Black Sea crop shipments since Moscow quit the U.N.-backed deal for Ukraine to export grain in July.

Most-active wheat futures were up 19 cents at $6.34-1/4 a bushel by 11:40 a.m. CDT (1640 GMT). Earlier this week, the contract hit its lowest price since June 1.

"Wheat-wise, we got a little bit overdone to the downside," said Matt Wiegand, commodity broker for FuturesOne.

CBOT soybeans were up 21-1/4 cents at $13.51-1/4 a bushel, after touching their highest since July 31. Corn rose 5-1/2 cents to $4.91-1/4 a bushel.

Traders covered short positions in the soy and corn markets ahead of the weekend, traders said, with weather forecasts showing little rain and hotter temperatures for the rest of August in the U.S. Midwest. Soybeans are seen as more vulnerable than corn to potential damage because August is the crop's critical month for development.

"There's going to be a significant amount of acres that are vulnerable to stress," Wiegand said.

The shift in weather helped markets to recover after corn fell to its lowest since December 2020 this week.

"Just as it looked as if it had turned all plain sailing for U.S. corn and soybean farmers," consultancy CRM Agri said in a note, "the weather outlook has turned more hostile again." (Reporting by Tom Polansek in Chicago; Additional reporting by Gus Trompiz in Paris and Naveen Thukral in Singapore; Editing by Rashmi Aich, Mark Potter and Barbara Lewis)