Invading Russian soldiers resumed their assault on Ukraine’s capital, Kyiv, as the sun rose Sunday morning.

Fighting broke out in the streets of Ukraine’s second-largest city, Kharkiv, barely 25 miles from south of the Russian border on Sunday morning after Russian forces invaded the city, authorities said.

Oleg Sinegubov, the Chairman of the Kharkiv Regional State Administration, said that “there has been a breakthrough in light equipment including in the central part of the city.”

An air alarm was issued at 8 a.m. on Sunday in the Ukrainian capital, Kyiv. In Bucha, a residential structure was struck by a Russian airstrike, according to the Kyiv Independent.

Sumy was also hit by an air raid warning Sunday morning as a Russian convoy entered the city, authorities claimed. More than 250,000 people live in this metropolis in the northeastern portion of the nation.

After being stalled by intense opposition by the outnumbered and outgunned Ukrainians, Russian soldiers overnight switched their focus to airfields and fuel facilities.

As explosions erupted all throughout the city, residents took cover in their homes’ basements, garages, and subway stations, ready for the next wave of assaults.

There are worries of probable radiation exposure after Russian missiles struck a nuclear waste disposal facility in Kyiv, Ukraine’s State Nuclear Regulatory Inspectorate said.

In a barrage of Russian airstrikes, the Kyiv branch of “Radon Association” is said to have taken a direct hit on a nuclear waste disposal facility. According to authorities, a first assessment indicated that no one outside of the site’s buffer zone was at risk, however it was not immediately obvious how much damage had been done.

Russian troops bombed an oil depot outside Kyiv earlier, igniting a big fire and spewing dense plumes of smoke in the air, raising concerns that the air was becoming poisoned.

Russia blew up a pipeline of gas in the Ukrainian city of Kharkiv, which is the country’s second-largest by population, causing a scary mushroom cloud to rise into the sky, according to footage. As a precaution against toxic smoke, local authorities advised citizens to cover their windows with moist cloth or gauze.

Ukraine’s cities were deserted overnight as the authorities imposed a curfew that would last until Monday morning.

At least 240 people have been dead since Russian President Vladimir Putin sent his soldiers into Ukraine on Wednesday, according to a UN assessment released on Saturday. More than 150,000 people from Ukraine have fled to Poland, Romania, and Moldova, all NATO members, as a result of the conflict in Ukraine. Fighting in Syria might lead to a mass exodus of 4 million people, according to the United Nations.

They think Putin intends to oust the Ukrainian government and install a new administration aligned to Moscow’s Cold War-era goals of establishing Russian dominance over Europe.

According to a member of the European Union Parliament quoting Ukrainian intelligence, Putin is furious that Russia’s invasion of Ukraine hasn’t been simple after Russian soldiers failed to conquer even one significant city in three days of warfare.