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".
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.
White hydrogen: Naturally occurring hydrogen
Chromite: Hard, metallic mineral containing iron oxide and chromium oxide
Ultramafic rocks: Dark-coloured rocks rich in magnesium or iron with very low silica content
Ophiolite: A section of the earth’s crust, which is oceanic in nature that has since been uplifted and exposed on land
Olivine: A commonly occurring magnesium iron silicate mineral that derives its name for its olive-green yellow-green colour
Breast cancer in men: the facts
1) Breast cancer is men is rare but can develop rapidly. It usually occurs in those over the ages of 60, but can occasionally affect younger men.
2) Symptoms can include a lump, discharge, swollen glands or a rash.
3) People with a history of cancer in the family can be more susceptible.
4) Treatments include surgery and chemotherapy but early diagnosis is the key.
5) Anyone concerned is urged to contact their doctor
The Bio
Favourite vegetable: “I really like the taste of the beetroot, the potatoes and the eggplant we are producing.”
Holiday destination: “I like Paris very much, it’s a city very close to my heart.”
Book: “Das Kapital, by Karl Marx. I am not a communist, but there are a lot of lessons for the capitalist system, if you let it get out of control, and humanity.”
Musician: “I like very much Fairuz, the Lebanese singer, and the other is Umm Kulthum. Fairuz is for listening to in the morning, Umm Kulthum for the night.”
UAE currency: the story behind the money in your pockets
SERIE A FIXTURES
Saturday (All UAE kick-off times)
Lecce v SPAL (6pm)
Bologna v Genoa (9pm)
Atlanta v Roma (11.45pm)
Sunday
Udinese v Hellas Verona (3.30pm)
Juventus v Brescia (6pm)
Sampdoria v Fiorentina (6pm)
Sassuolo v Parma (6pm)
Cagliari v Napoli (9pm)
Lazio v Inter Milan (11.45pm)
Monday
AC Milan v Torino (11.45pm)
'The worst thing you can eat'
Trans fat is typically found in fried and baked goods, but you may be consuming more than you think.
Powdered coffee creamer, microwave popcorn and virtually anything processed with a crust is likely to contain it, as this guide from Mayo Clinic outlines:
Baked goods - Most cakes, cookies, pie crusts and crackers contain shortening, which is usually made from partially hydrogenated vegetable oil. Ready-made frosting is another source of trans fat.
Snacks - Potato, corn and tortilla chips often contain trans fat. And while popcorn can be a healthy snack, many types of packaged or microwave popcorn use trans fat to help cook or flavour the popcorn.
Fried food - Foods that require deep frying — french fries, doughnuts and fried chicken — can contain trans fat from the oil used in the cooking process.
Refrigerator dough - Products such as canned biscuits and cinnamon rolls often contain trans fat, as do frozen pizza crusts.
Creamer and margarine - Nondairy coffee creamer and stick margarines also may contain partially hydrogenated vegetable oils.
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PROFILE OF SWVL
Started: April 2017
Founders: Mostafa Kandil, Ahmed Sabbah and Mahmoud Nouh
Based: Cairo, Egypt
Sector: transport
Size: 450 employees
Investment: approximately $80 million
Investors include: Dubai’s Beco Capital, US’s Endeavor Catalyst, China’s MSA, Egypt’s Sawari Ventures, Sweden’s Vostok New Ventures, Property Finder CEO Michael Lahyani