Ukrainian President Volodymyr Zelenskyy said Sunday that Russia launched more than 550 munitions into the country overnight in Moscow’s latest deadly long-range barrage.

Zelenskyy said that at least five people were killed and 10 injured across Ukraine. Impacts were reported in Lviv, Ivano-Frankivsk, Zaporizhzhia, Chernihiv, Sumy, Kharkiv, Kherson, Odesa and Kirovohrad regions, the president wrote in a Telegram post.

Russia launched some 500 strike drones and 50 missiles, Zelenskyy said. “Today the Russians again struck our infrastructure, everything that ensures a normal life for people,” he wrote. 

“More protection is needed, faster implementation of all defense agreements, especially regarding air defense, to make this aerial terror meaningless,” he added.

“A unilateral ceasefire in the sky is possible, and it could open the way to real diplomacy,” Zelenskyy said. “America and Europe must act to force Putin to stop”

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The strikes were concentrated in western Ukraine. In the city of Lviv close to the Polish border, at least four people were killed and four others injured, according to the State Emergency Service of Ukraine (DSNS).

Lviv Mayor Andriy Sadovyi reported “a very tough night” in a post to Telegram, saying the buildings hit included an industrial park to the west of the city center.

“Russians terrorized the region for over five hours with combined strikes,” the DSNS reported.

In western Ivano-Frankivsk and western-central Vinnytsia region, Russian strikes hit civilian and critical infrastructure facilities, local officials said.

Elsewhere, at least one person was killed and 10 injured in the southern frontline Zaporizhzhia region. 

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Gov. Ivan Fedorov said in a post to Telegram that Russian munitions damaged gas pipelines, residential homes and other buildings. Over 73,000 customers were left without power supply, Fedorov said.

A strike on critical infrastructure was also reported in Chernihiv, close to the Belarusian and Russian borders northeast of Kyiv.

The Russian attacks prompted the scrambling of NATO jets across the border in Poland. 

Poland’s Operational Command said in social media posts that fighters were deployed and air defense units put on alert as “the Russian Federation once again carried out strikes on targets located in the territory of Ukraine.”

The alert lasted for around four hours. Dutch F-35 jets were among those responding, a later statement said. “No violations of Polish airspace were observed,” the command said.

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Russia’ Defense Ministry, meanwhile, said its forces shot down 32 Ukrainian drones overnight.

Temporary flight restrictions were introduced at airports in Tambov, Nizhny Novgorod and Yaroslavl, Russia’s federal air transport agency — Rosaviatsiya — said.