By ELENA BECATOROS, OLEKSANDR STASHEVSKYI and CIARAN McQUILLAN, Associated Press POKROVSK, Ukraine (AP) — In what would be its biggest victory yet in the war with Ukraine, Russia claimed to have captured Mariupol after a nearly three-month siege that reduced much of the strategic port city to a smoking ruin, with over 20,000 civilians feared dead. Russian Defense Minister Sergei Shoigu reported to