MOSCOW—Russia must prioritize grain supplies to domestic bakeries over export markets, Prime Minister Mikhail Mishustin said as he unveiled fresh measures to support the domestic economy on Wednesday in the face of international sanctions over Ukraine. Russia and Ukraine are both major wheat exporters, and the military conflict is threatening global grain production and the supply of edible oils and fertilisers exports, sending commodity prices rocketing and mirroring the crisis in energy markets. “This is important to keep the food market in balance and we are closely monitoring prices for the most essential social goods such as food, including bread,” Mishustin told a governmental meeting. “Russian grain is in good demand from abroad and its price is increasing. That said, it is necessary to provide the necessary raw materials, first of all, to the domestic baking industry.” Mishustin did not say whether Russia would try and limit grain exports—a step …