Russian troops steadily advance in Sumy Region -- military expert / Russian troops liberate Doroshovka community in Kharkov Region over past day / Russian forces have come close to Doroshovka in Kharkov region -- expert / Russian army extensively advances in Kupyansk direction -- expert / Russian troops developing an offensive in the south of the DPR -- Defense Ministry / 'Propaganda lessons for everyone': Russia's wartime curriculum exposed / Russian military engaged in tough battles with Ukrainians in Kharkov Region -- official / Russian troops liberate DPR's Leninskoye, Makarovka / Russian troops fight for native Russian territories during special op -- Putin / ISW: Russian military pursues dual tactical efforts around Pokrovsk