Since the beginning of the Russian aggression against Ukraine in 2014, Alexander Sladkov has been working in the occupied territories to justify Russia's invasion of Ukraine and the war crimes of the Russian army against the civilian population of Ukraine.

On his social media channels, he openly calls for the genocide of the civilian population of Ukraine and the destruction of Ukrainian cities that will resist the Russian occupation forces. He is also actively trying to promote the propaganda narrative of Ukraine as a neo-Nazi state:

"This is ordinary fascism...when Ukrainian cities continue to burn, do not ask why and for what reason" 

"I want dozens of heavy missiles to be launched from combat positions in Russian lands tonight. "I will not be satisfied with Iskanders today. I want Khreshchatyk to turn into smoke and ashes."

Commenting on the training of the Ukrainian Armed Forces in the UK, he said:

"I think we should open camps with anti-American training for soldiers from Venezuela, Iran and North Korea. Not anti-terror, but anti-Anglo-Saxon."

Sladkov regularly interrogates Ukrainian prisoners of war and political prisoners, who, after being tortured by Russian special services, are used to create propaganda stories. He participated in the interrogation of the arrested Ukrainian journalist Stanislav Aseyev. 

In April 2020, Oleksandr Sladkov posted a video on his YouTube channel from the positions of the Russian-terrorist forces near the city of Horlivka, Donetsk region (at that time uncontrolled by Ukraine), which showed the use of 122 mm calibre shells by the militants, which were banned under the Minsk agreements.

On 23 July, the media reported that the car in which Sladkov was travelling could have run over a person to death on 13 July 2022 in the village of Varvarovka, Luhansk region (at that time, the village was occupied by Russia). According to relatives, the only witness to the accident, a woman, was abducted the day after the incident and has not been in touch since. The car's make and licence plate matched the car that had been given to Sladkov the day before. The video showing how Sladkov was presented with the car and the number plate was removed from the website after 13 July. 

On 23 July, Sladkov himself recorded several video messages in which he denied his guilt, but he lied that he had not been in the Luhansk region and that he had not used the car. Evidence of his stay in the then-occupied Luhansk region and the use of the machine can be found in numerous video publications on Sladkov's own telegram channel, which were recorded during this period.

He is listed in the database of the Myrotvorets Centre.