The official, who took part in the three-day Munich Security Conference, which ended on Sunday, told Polish Radio Three on Monday that the news of Navalny’s death was initially a shock for the conference participants.

But then proposals started coming in to go further in imposing sanctions on Russia, he added.

Kowal believes that more should be done than “just freezing of the Russian money that is in the West or confiscation of the assets of oligarchs.”

He argued that Ukrainians should be supported “in such a way that they will be able to hold the front line and move forward this year... and be provided with such weapons that they will be able to attack military and strategic targets in Russia.”

According to Kowal, “Navalny’s death could be a turning point for this support.”

Navalny, an outspoken Kremlin critic who was considered one of Putin’s most significant enemies, “died after apparently collapsing and losing consciousness” at a penal colony north of the Arctic Circle, the Russian prison service announced on Friday.