Attacks by Ukrainian long-range drones caused flight disruption at Moscow’s main airports for a third straight day on Wednesday as Russia prepared to receive the Chinese president and other foreign leaders for the annual Victory Day military parade in Red Square.

Russian flag carrier Aeroflot on Wednesday morning canceled more than 100 flights to and from Moscow. More than 140 Aeroflot flights also were delayed because of what officials described as the Ukrainian drone threat and amid heightened security measures around the Victory Day events.

Russian air defenses repelled an attack by nine drones close to the Russian capital, Moscow Mayor Sergei Sobyanin said in the early hours of Wednesday. In the evening, Sobyanin reported thwarting 15 more drones targeting Moscow, as flights were restricted in Moscow’s airports once again.

80th anniversary

Though Ukrainian drones have targeted Moscow in the past, the sustained attacks appeared designed to disrupt preparations for the 80th anniversary celebrations marking victory over Nazi Germany in World War II — Russia’s biggest secular holiday of the year.

The repeated assaults could unnerve Russians, who have been told by President Vladimir Putin that the more than three-year war with Ukraine is going well, as well as potentially embarrass him in front of his illustrious guests.

Security is expected to be tight for Friday’s centerpiece parade. Foreign dignitaries, including China’s President Xi Jinping and Brazilian President Luiz Inácio Lula da Silva, arrived on Wednesday.

Russia plans a unilateral 72-hour ceasefire to coincide with the celebrations in Moscow. In March, the United States proposed a 30-day truce in the war, which Ukraine accepted, but the Kremlin has held out for ceasefire terms more to its liking.

Ukrainian President Volodymyr Zelenskyy said last weekend that his country cannot provide security assurances to foreign officials planning to visit the Moscow events. Russia could stage provocations and later attempt to blame Ukraine, he said.

“Our position is very simple: we cannot take responsibility for what happens on the territory of the Russian Federation,” he said. “They are the ones providing your security, and we will not be offering any guarantees.”

Zelenskyy said that he had instructed Ukraine’s Foreign Ministry to advise foreign delegations against visiting Russia during this period.

Missile, drone attacks

Meanwhile, Russia launched a ballistic missile and drone attacks at Ukraine’s capital before dawn on Wednesday, killing at least two people in apartment buildings, Ukrainian officials said. Eight people were also wounded in the attack, the Kyiv City Military Administration said in a post on Telegram.

Russian planes also dropped two glide bombs on a village in Ukraine’s eastern Donetsk region, killing two women, regional administration head Vadym Filashkin said.

Russia launched a total of four ballistic missiles and 142 drones at Ukraine overnight, Zelenskyy said.

At least one of the ballistic missiles and 28 drones were recorded in Kyiv’s airspace, authorities said. Air defense forces shot down the missile and 11 drones.