On May 9, Russia will mark the 80th anniversary of the Soviet Union’s victory in World War II. The centerpiece of the Victory Day holiday is a military parade on Moscow’s Red Square. This year, leaders from nearly 20 countries are expected to attend — and there are rumors that North Korean soldiers, who have been fighting alongside Russian troops, may march in the parade. But with the war in Ukraine grinding on, Russian officials seem increasingly on edge. President Vladimir Putin proposed a brief ceasefire during the holiday, but rejected Ukraine’s counteroffer of an immediate 30-day truce. Now, in the lead-up to the celebrations, Russian authorities are warning of possible Internet restrictions and urging people not to set off fireworks, citing security concerns. Here’s what we know so far about how the Kremlin is preparing to safeguard its show of military might.