Russia’s Defense Ministry declared a unilateral ceasefire in Ukraine for Friday and Saturday to mark the 81st anniversary of the defeat of Nazi Germany in World War II, but it threatened to strike back at Kyiv if it tries to disrupt the Victory Day festivities.

The Defense Ministry said in a statement Monday that it hoped Ukraine “will follow suit” on the ceasefire for Russia’s most important secular holiday. There was no immediate comment from Ukrainian authorities.

Authorities last week decided to pare down the traditional military parade on Moscow’s Red Square, citing concerns over possible Ukrainian attacks. Ukraine has been launching drone attacks deep inside Russia to counter its more than 4-year-old invasion.

The Defense Ministry said if Ukraine attempts to disrupt Saturday’s celebrations, Russia will carry out a “massive missile strike on the center of Kyiv.” It warned the civilian population there and employees of foreign diplomatic missions of “the need to leave the city promptly.”

Russian President Vladimir Putin last week floated the idea of a ceasefire for Victory Day in a phone conversation with U.S. President Donald Trump.

For years, the Kremlin has used the pomp-filled Victory Day parade to showcase its military might and global clout, and it has been a source of patriotic pride.

But the parade in the Russian capital will take place without tanks, missiles and other military equipment for the first time in nearly two decades. Some of the smaller parades that are held elsewhere across the country have also been pared down or even canceled for security reasons.

World War II remains a rare point of consensus in Russia’s divisive history under Communist rule. The Soviet Union lost 27 million people in what it called the Great Patriotic War in 1941-45, an enormous sacrifice that left a deep scar in the national psyche.

Putin, who has ruled Russia for over 25 years, has turned Victory Day into a key pillar of his tenure and has tried to use it to justify the war in Ukraine.

Last year’s parade on the 80th anniversary drew the most global leaders to Moscow in a decade, including high-profile guests like Chinese President Xi Jinping, Brazilian President Luiz Inácio Lula da Silva and Slovakia’s Prime Minister Robert Fico.

Putin had declared a unilateral 72-hour ceasefire starting May 7, 2025, and authorities blocked cellphone internet in Moscow for several days to avert Ukrainian drone attacks.