In this photo provided by the Ukrainian Emergency Service, emergency services personnel work to extinguish a fire following a Russian drone attack on a gas pipeline in Dnipropetrovsk region, Ukraine, Wednesday.(Ukrainian Emergency Service via AP)

KYIV, Ukraine (AP) — Russia fired at least 800 drones in a massive daytime barrage on about 20 regions of Ukraine on Wednesday, killing at least six people and wounding dozens, including children, in one of the longest attacks by Moscow in the 4-year-old war, President Volodymyr Zelenskyy said.

The attack began in midmorning and lasted for hours in the capital of Kyiv, the western city of Lviv near Poland, and the port of Odesa on the Black Sea, among other population centers, Zelanskyy said on the Telegram messaging app.

“Our soldiers are defending Ukraine, but Russia’s obvious goal is to overload air defenses,” Zelenskyy said, as the bombardment stretched into the late afternoon. He cautioned that a cruise and ballistic missile attack could follow the drone barrage.

It was “one of the longest, massive Russian attacks against Ukraine,” he said on social media.

It also rattled neighbors. Hungarian Prime Minister Péter Magyar said his new government has summoned the Russian ambassador over a drone attack near Hungary’s border, in a significant shift from his predecessor Viktor Orbán’s friendly relations with Moscow.

“The Hungarian government strongly condemns the Russian attack on Transcarpathia,” Magyar told journalists, adding that Foreign Minister Anita Orbán will speak with the ambassador Thursday morning.

The foreign minister will ask “when Russia and Vladimir Putin plan to finally end this bloody war,” Magyar added.

“Thank you for your compassion and strong position!” Zelenskyy said on X after Magyar’s comments.

Drone debris fell in an open area in Kyiv’s Obolonskyi district with no casualties, city officials said, as air defense systems engaged Russian drones over the capital. Mayor Vitali Klitschko said emergency services responded to the scene. Explosions were heard across the city earlier Wednesday.

Three people were killed in a drone attack in the Rivne region west of Kyiv, according to Oleksandr Koval, head of the regional military administration.

Moscow’s attacks are unrelenting, even as Ukraine is emboldened by its recent military accomplishments and as U.S. President Donald Trump and Russian President Vladimir Putin said — without providing evidence — that the war could be approaching an end.

On Tuesday, Zelenskyy said, 14 Ukrainian regions came under attack, followed by overnight strikes on Ukraine’s residential, energy and railway infrastructure.

“It is important to support Ukraine and not remain silent about Russia’s war. Every time the war disappears from the top of the news, it encourages Russia to become even more savage,” Zelenskyy said, apparently referring to the world’s attention being focused on the Iran war.

Trump said Tuesday said he believes Moscow and Kyiv will soon reach a deal to end fighting.

“The end of the war in Ukraine I really think is getting very close,” Trump said as he left the White House for a summit in Beijing. “Believe it or not, it’s getting closer.”

Putin said in a speech last weekend that his invasion of Ukraine is possibly “coming to an end.”

Neither leader elaborated on what persuaded them about the possibility of peace in Europe’s longest conflict since World War II. U.S.-led diplomatic efforts over the past year to end the war have fizzled after making no progress on key issues, such as whether Russia gets to keep Ukrainian land it has seized and what can be done to deter Moscow from invading again.