Ukrainian President Volodymyr Zelensky has fired the head of the department responsible for his personal protection after two of its officers were detained this week over an alleged assassination plot.
Mr Zelensky published a decree to "dismiss Sergiy Leonidovich Rud from the post of head of the State Protection Department of Ukraine".
It did not state a reason for Mr Rud's removal or name a replacement to the highly sensitive position.
The announcement came after Ukraine's SBU security service announced Tuesday it had foiled a Russian plot to assassinate Mr Zelensky and other senior officials.
It said it had detained two colonels from the bodyguard department on suspicion of passing secret information to Russia's rival FSB security service.
One of them, it alleged, had personally provided rocket rounds, drones and anti-personnel mines for an agent to carry out attacks.
Mr Rud, 47, had headed the department - which oversees the personal security of the president, other senior officials and their families - since 2019.
Mr Zelensky has been a target for Russia since it invaded Ukraine in February 2022.
He said last year that he was aware of at least "five or six" foiled assassination plots against him.
Putin Victory Day speech
It comes as Russian President Vladimir Putin warned his nuclear forces were "always" on alert and added that Moscow would not tolerate any Western threats, in an address at the annual Victory Day parade in Moscow.
In a defiant speech on Red Square before thousands of soldiers dressed in ceremonial attire, Mr Putin heaped praise on his army fighting in Ukraine and accused "Western elites" of fomenting conflicts around the world.
"Russia will do everything to prevent a global clash, but at the same time we will not allow anyone to threaten us. Our strategic forces are always on alert," Mr Putin told the crowd.
"Russia is now going through a difficult, crucial period. The fate of the Motherland, its future depends on each of us," he said.
The 9 May 9 parade commemorates the Soviet Union's defeat of Nazi Germany in World War II and has become the Kremlin's most important public holiday as Putin puts the country firmly on a combat footing.
Ukraine steps up Russian territory attacks
Ukraine has stepped up attacks on Russian territory of late, targeting energy sites in particular.
Eight people were injured in overnight Ukrainian attacks in and around the western Russian city of Belgorod, officials and the army said.
Regional governor Vyacheslav Gladkov said several apartment blocks and homes were damaged.
"The city of Belgorod and Belgorod district were subjected to an air attack by the Ukrainian Armed Forces.
"There are direct hits on residential apartment buildings and cars," Mr Gladkov said on the messaging app Telegram.
"According to preliminary information, eight people were injured: seven adults and one child."
Five people with shrapnel wounds, including an 11-year-old girl injured in the foot, were taken to hospital, while the other three victims were treated at the scene, he added.
In Belgorod city, 19 apartment buildings, one private residence and 37 vehicles were damaged, Mr Gladkov said.
In nearby Dubovoe, four homes and three cars were damaged, he added.
Situated close to the border, Belgorod is frequently targeted by Ukrainian drone attacks, including one on Monday that killed six people and wounded 35.
