Russia's top security agency said Thursday that it has arrested several suspects accused of involvement in an alleged Ukrainian plot to assassinate senior military officers, an announcement that follows the killing of a top Russian general last week.

The Federal Security Service, a top KGB successor known under its Russian acronym FSB, said in a statement carried by Russian news agencies that it had arrested four Russians accused of making preparations to kill senior Defense Ministry officials.

The FSB said that the suspected organizers of the attacks were planning to kill one of the senior officers using a remotely controlled car bomb. It added that another top military official was to be assassinated by an explosive device hidden in an envelope. The agency didn't name the military officers who were targeted in the alleged plot.

The FSB released a video showing the arrest and interrogation of the suspects, who weren't named.

The statement follows the death of Lt. Gen Igor Kirillov who was killed on Dec. 17 by a bomb hidden on an electric scooter parked outside his apartment building as he left for his office. Kirillov's assistant also died in the brazen attack that was claimed by Ukraine and brought the conflict once again to the streets of the Russian capital.

The FSB has arrested a suspect, a citizen of the Central Asian nation of Uzbekistan, and claimed that he said that he had been recruited by Ukrainian special services.

Kirillov, 54, was the chief of Russia's Radiation, Biological and Chemical Protection Forces. These special troops are tasked with protecting the military from the enemy's use of nuclear, chemical or biological weapons and ensuring operations in a contaminated environment.

Russian President Vladimir Putin described Kirillov's killing as a "major blunder" by Russia's security agencies, noting they should learn from it and improve their efficiency.

Meanwhile, Ukrainian officials said Wednesday that Russia launched a massive missile and drone barrage targeting Kyiv's energy infrastructure, striking a thermal power plant and prompting many to take shelter in metro shelters on Christmas morning.

Russia's Defense Ministry said it had carried out a "massive strike" on what it said were critical energy facilities in Ukraine that support the work of Kyiv's military-industrial complex, Reuters reported.

The Russian attack left half a million people in the Kharkiv region without heat with temperatures just a little above zero Celsius and there were blackouts in the capital, Kyiv, and elsewhere, Reuters added.

The strikes wounded at least six people in Kharkiv and killed one in the Dnipropetrovsk region, the governors there said, according to Reuters.

In a statement on X, Ukrainian President Volodymyr Zelenskyy said over 70 missiles, including ballistic missiles, and over 100 attack drones were used to strike Ukraine's power sources.

Putin deliberately chose Christmas for an attack. What could be more inhumane?" Zelenskyy said. "They continue to fight for a blackout in Ukraine."

U.S. President Biden on Wednesday denounced Russia's attack, saying the "purpose of this outrageous attack was to cut off the Ukrainian people's access to heat and electricity during winter and to jeopardize the safety of its grid."

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