KYIV, Ukraine (AP) - Ukraine’s two largest cities came under attack from Russian hypersonic ballistic missiles on Tuesday morning, killing at least four people and injuring almost 100, officials said, as the war approached its two-year milestone and the Kremlin’s forces stepped up their winter bombardment of urban areas.

Ukraine President Volodymyr Zelenskyy said on his Telegram channel that four civilians were killed and 92 injured in the capital, Kyiv, and in northeastern Kharkiv as hypersonic Kinzhal missiles that can fly at 10 times the speed of sound slammed into city blocks.

Russia fired almost 100 missiles of various types, Zelenskyy said on X, formerly Twitter. He claimed that at least 70 missiles were shot down, almost all of them in the Kyiv area, and said Western-supplied air defense systems such as Patriots and NASAMS had saved hundreds of lives.

Russia’s Defense Ministry said it had launched missile and drone strikes on military industrial facilities in and around Kyiv. Depots storing missiles and munitions supplied by Ukraine’s Western allies were also targeted, it said.

“The goal of the strike has been achieved, all the targets have been hit,” it said without elaborating. It was not possible to independently verify either side’s claims.

Since Sunday, Zelenskyy said, Russian forces have launched about 170 Shahed drones and “dozens of missiles of various types” in an onslaught against Ukrainian targets. Most were aimed at civilian areas, he said.

The Kh-47M2 Kinzhal is an air-launched hypersonic ballistic missile. Russian forces rarely use such expensive missiles against Ukraine due to their limited stocks.

The attacks created a desolate morning scene in the capital, with most cafes and restaurants remaining closed. Many people opted to stay indoors or seek refuge in shelters as powerful explosions shook the city from early morning.

Air raid sirens blared for nearly four hours, and the city’s subway stations - which function as shelters - were crowded.

After the Ukrainian air force issued warnings about incoming hypersonic missiles, people wearing pajamas underneath their coats took sleeping bags, mats and their pets to subway stations while loud explosions echoed above the city. At one of the central stations, called Golden Gates, hundreds of people filled the spacious underground areas while trains continued to run.