[1/3] Ukraine's President Volodymyr Zelenskiy speaks during a joint news conference with Czech Prime Minister Petr Fiala (not seen), as Russia's attack on Ukraine continues, in Kyiv, Ukraine October 31, 2022.
Ukraine's success in Kherson, where its troops now control more than 60 regional settlements, as well as in other places, benefited partly from resistance in the Donetsk region, despite repeated Russian attacks, Zelenskiy added.
"There it is just hell - there are extremely fierce battles there every day," he said.
In a telephone call, Russian President Vladimir Putin and Iranian President Ebrahim Raisi emphasised "further enhancing cooperation in the political, trade and economic fields, including the transport and logistics sector," the Kremlin said on Saturday.
The visit followed accusations by Ukraine and the West that Russia has used Iranian drones to target Ukraine's energy infrastructure.