Russia is commemorating the 81st anniversary of the Nazi invasion of the Soviet Union on Wednesday amid Moscow’s assault on Ukraine that has killed thousands and triggered Europe's largest refugee crisis since World War II. June 22 — the date when Hitler’s forces invaded the Soviet Union as part of Operation Barbarossa in 1941 — marks the start of what Russia calls the Great Patriotic War and is today known in the country as Day of Remembrance and Sorrow. The Main Cathedral of the Russian Armed Forces kicked off commemorations after midnight with a Divine Liturgy and a memorial service...