According to Russia, the drone attack on the Kremlin was done by Ukraine to kill Vladimir Putin. (File photo)

Russia's presidential Kremlin said on Thursday that Russian security agencies were aware of what was happening after Ukraine's top intelligence official said Russian President Vladimir Putin was at the top of a list of assassinations.

According to a Reuters report, Vadim Scibitsky, the deputy head of Ukraine's military intelligence service, said in an interview with Germany's Die Welt newspaper that Ukraine wanted to kill Vladimir Putin "because he monitors the war, and makes all the decisions" and that the Russian president was also aware that he was at the top of Ukraine's assassination list.

"But ultimately, everyone will have to answer for their actions," Vadim Skibitsky was quoted as saying in the report.

"Putin sees that we are getting closer to him, but he also fears being killed by his own people," Vadim Skibitsky told Die Welt.

Skibitsky also named other Russian citizens who are on the hit list — Mercinery chief Yevgeny Prigozhin, Russian Defence Minister Sergei Shoigu, General Staff Chief Valery Gerasimov and military commander Sergei Surović, whom the Russian media has dubbed "General Armageddon".

Skibitsky also said That Vladimir Putin is a difficult target because he is "hidden" for a long time, but now he is more publicly visible than before.

Asked if security arrangements were being increased for Vladimir Putin after Skibitsky's interview, Kremlin spokesman Dmitry Peskov said: "Trust me, our security agencies know their job, and they know what to do."

Peskov said Skibitsky's interview confirmed that the "special military operation" Russia launched in Ukraine 15 months ago was correct.

Russia described a drone strike on the Kremlin earlier this month as an attempt by Ukraine to kill Putin, but Ukraine denied it at the time.