The International Atomic Energy Agency on Sunday said it was calling an extraordinary meeting of its board of governors next week "to discuss the current situation in Ukraine".
The meeting will begin at 11am on Wednesday at the IAEA's Vienna headquarters, the agency said.
It said Director General Rafael Grossi "is actively in contact with all involved to ensure the safety and security of nuclear facilities and material in Ukraine".
Ukraine has four active nuclear power plants and stores of nuclear waste such as the one at Chernobyl.
Chernobyl was the site of the worst nuclear accident in history in 1986 and on Thursday it fell to Russian troops.
Ukrainian authorities said that radiation levels had increased there after the Russian takeover but the IAEA said the levels remained low and did not "pose any danger to the public".
The IAEA also said it had been told by Ukraine that "missiles hit the site of a radioactive waste disposal centre in Kiev overnight, but there were no reports of damage to the building or any indications of a radioactive release".
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A solemn welcoming ceremony of US soldiers at Adazi military base, Latvia, on February 25, 2022. More than 300 soldiers of the 173rd Air Force Brigade arrived to demonstrate the US commitment to defend Nato allies and strengthen Latvia's defence capabilities following Russia's military operation in Ukraine. EPA -
US paratroopers in Ukraine's western Lviv region during a Nato-sponsored training exercise in 2020. AP -
A US military aircraft takes off at the US Air Base Ramstein, in Landstuhl, Germany, on February 25. US President Joe Biden February 24 authorised the deployment of further armed forces to Germany as part of Nato's response to Russia's military aggression on Ukraine. EPA -
Nato Secretary General Jens Stoltenberg at the alliance's headquarters in Brussels, Belgium, on February 25. EPA -
A convoy of British armoured vehicles of the Royal Welsh Battlegroup on the way to Estonia, driving through Liepupe, Latvia, on February 25. British troops and equipment are heading to Estonia as part of the UK's contribution to strengthen Nato's uplift to Eastern Europe. EPA -
Protesters outside a Nato leaders virtual summit in Brussels on February 25. AP -
A US Air Force F-35 Lightning II aircraft assigned to the 34th Fighter Squadron receives fuel from a KC-10 Extender aircraft over Poland on February 24. US Air Force/Reuters -
US military personnel check an Apache attack helicopter AH-64 during a technical stop on the tarmac at Traian Vuia International Airport in Timisoara, Romania, on February 24. EPA -
German soldiers of the Nato enhanced Forward Presence (EFP) Battalion Battle Group in Lithuania attend a ceremony during a visit of German Defence Minister Christine Lambrecht to Rukla Military Base, Lithuania, on February 22. EPA
But Mr Grossi said such incidents "highlight the very real risk that facilities with radioactive material will suffer damage during the conflict, with potentially severe consequences for human health and the environment".
"Once again, I urgently and strongly appeal to all parties to refrain from any military or other action that could threaten the safety and security of these facilities," he said.
The meeting on Wednesday will be days before a scheduled board of governors meeting and coincides with a crucial phase of efforts to fully restore the 2015 deal on Iran's nuclear programme.
Diplomats from Britain, China, France, Germany, Iran and Russia have been taking part in talks on reviving the accord in Vienna, with their success or failure widely expected to hinge on negotiations in the coming days.
The US has been taking part in the talks indirectly.
