Ukrainian President Volodymyr Zelensky said Friday that Mariupol is one of the most complicated points of this war, accusing Russians of blockades and torture with starvation, during a virtual event held by policy institute Chatham House to discuss the war.

Read here More than two weeks in inhumane conditions: a "filtration camp" for Mariupol residents

When asked about the situation in Mariupol, Zelensky said all the international organizations — including Ukrainian ones — are prohibited from entering the area to provide water, food and other supplies to civilians. He added that the Russian military's treatment in Mariupol is "inhuman" and a "beastly attitude."

Zelensky also claimed that Russia is calculating how much time is needed for nuclear missiles to hit European capitals.

Speaking at a virtual event held by policy institute Chatham House to discuss the war, Zelensky said: "Russia believes that their responsibility can be postponed for decades, and they don't think they will be responsible for the war crimes because they have the power of the nuclear state and nuclear blackmail after many decades."