Ukraine war latest: Putin proposes firing Shoigu, appoints new defense minister
Key developments on May 11,12: * Putin proposes firing Shoigu, appointing new defense minister * Zelensky says Russian troops try to "gain a foothold" in Kharkiv Oblast; heavy fighting ongoing * Russia's breakthrough attempt halted, situation in several sectors' changing rapidly,' Syrskyi says * Russia attacks 106 infrastructure facilities in Ukraine in