African countries' interest in Russian grain steadily high -- expert / BRICS members welcome Russia's initiative to establish grain exchange -- Kazan Declaration / BRICS countries back Russia's initiative to create grain exchange -- agriculture minister / EU agrees tariffs on Russian, Belarusian grain imports from July / How Russia's 'grain diplomacy' is reshaping global trade dynamics / Introduction of duties on Russian grain will hit EU countries -- agricultural regulator / European Commission suggests 'prohibitive' tariffs on Russian, Belarusian grain / Egypt, reliant on imports, buys more Russian wheat / US to world: Must tell Russia to stop using grain for blackmail / UN chief casts doubts on Russia’s promise of free grain for African countries