Mr Zelensky is calling for stricter sanctions, including an oil embargo and complete withdrawal of foreign companies.
British military intelligence said on Friday that Russian forces were continuing their ground assault on the Azovstal steel plant for a second day.
Germany has reached an agreement to supply Ukraine with seven self-propelled armoured howitzers.
“Nobody wants to see a nuclear war happen. Dangerous rhetoric is clearly unhelpful. And something that we won’t engage in.”
Russia claims that such arms deliveries were aimed at weakening it and undermining peace agreement efforts.
Mr Shoigu announced this on Thursday at a meeting with President Vladimir Putin broadcast on state television.
UN humanitarians said no fewer than 870,000 people who fled abroad since the Russian invasion of Ukraine on February 24 had returned home.
Since the war began, Mr Coveney is the first foreign minister on the UN Security Council to visit Kyiv.
“We are outraged that attacks on health care are continuing. Attacks on health care are a violation of international humanitarian law,” said the WHO chief.
“It was not only about accountability for Russia,” she said. “But also about standing with the people of Ukraine.”
