The broadcaster said satellite photos show truck convoys transporting grain from the Zaporizhzhia and Kherson regions to Russian-occupied Crimea, as well as storage facilities in the Donetsk and Luhansk regions.
Radio Svoboda also said at least 12 ships transporting grain were seen in the port of Sevastopol.
The broadcaster also quoted Ukrainian official as saying that Russia was trying to sell the grain in Egypt and Liban, but their offers were turned down.
Ukraine is a leading global exporter of grain, according to experts.
Due to the war and the resulting Russian blockade of Black Sea ports, it has been unable to bring its harvest to the world.
Earlier this month, the United Nations warned that the number of people suffering from acute hunger could rise by 47 million worldwide if the war in Ukraine continued.
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Source: PAP