Russia holds its most scaled-back Victory Day parade in years on Saturday due to the threat of attack from Ukraine, where victory ​for Moscow's forces has proven elusive more than four years into the deadliest European conflict since World War Two.

Tensions are high as Russia prepares to celebrate its most important secular holiday Saturday. Fears in Moscow about security amid the war with Ukraine have forced officials to scale back the annual celebrations, and signs of domestic discontent are casting a shadow over President Vladimir Putin’s Red Square events.

Ukraine piled pressure on Russia Tuesday after announcing its own truce in response to Russia's demand for a ceasefire to coincide with its annual World War II Victory Day commemorations.

Drone strikes on refineries and ports have caused some disruption but had little impact on Moscow’s oil revenues.

Ukrainian drones are flying deep into Russia to strike oil facilities, sending up plumes of smoke that can be seen from space and bringing toxic rain to tourist destinations on the Black Sea. The attacks are aimed at slashing Moscow’s oil exports,