May 9 (Reuters) - Russia fired cruise missiles at Kyiv and paraded troops across Red Square for its annual celebration of victory in World War Two, pared back amid shortages of manpower and weaponry at the front after a failed winter campaign in Ukraine. SYMBOLIC DAY * President Vladimir Putin said Russians were united in a "sacred" fight with the West over Ukraine but the strains of war were evident at one of the most pared back anniversaries of the victory over Nazi Germany in decades. * European Commission President Ursula von der Leyen hailed Ukraine as "the beating heart...