Ukraine’s national nuclear regulator told the International Atomic Energy Agency on Monday that a new nuclear research facility producing radioisotopes for medical and industrial applications had been damaged by shelling in the city of Kharkiv on Sunday.

The incident did not cause any increase in radiation levels at the site.

The nuclear material in the facility is always subcritical, the IAEA said, and the inventory of radioactive material is very low, so the damage reported would not have any radiological consequence.

Eight of Ukraine’s 15 reactors are currently operating, the IAEA said, citing Ukraine’s nuclear regulator.

IAEA Director General Grossi noted there have been several episodes compromising safety at Ukraine’s nuclear sites, including a recent fire at the Zaporizhzhya Nuclear Power Plant, where two reactors are still operational.

-ABC News’ Christine Theodorou

Ukraine and Russia’s foreign ministers have agreed to meet on the sidelines of a diplomatic forum in Turkey on Thursday in what will be the highest level direct meeting between the two sides since Russia’s invasion.

The meeting was agreed following a call between Turkish President Recep Tayyip Erdogan and Russian President Vladimir Putin on Sunday.

Russia’s foreign ministry spokesperson Maria Zakharova earlier confirmed the two had agreed to a meeting. Ukraine’s foreign minister Dmytro Kuleba has also confirmed it.

It’s not clear that there is much the two will be able to agree on, but it still signals a readiness by Russia to talk. For now, Russia is continuing to put forward hardline demands that Ukraine guarantee it will never join NATO or the European Union.

-ABC News’ Patrick Reevell

Russia's military has announced another temporary cease-fire in Ukraine beginning Tuesday at 10 a.m. local time and said it is prepared to open humanitarian corridors from Kyiv and several other key Ukrainian cities it has encircled.

In a statement, the Russian Ministry of Defense said the corridors would allow people to go north to Russia and its ally Belarus, adding that it would also allow routes in some places to other parts of Ukraine.

The ministry said there will be corridors from Kyiv, as well as the northern cities Chernihiv and Sumy and the key eastern cities Kharkiv and Mariupol.

Russia had initially proposed corridors only to Russia and Belarus, which Ukraine had rejected as "immoral."

However, Russia has previously violated its own cease-fire, shelling evacuation areas, and it is unclear if corridors for people to move within Ukraine will actually be made available.

Russian President Vladimir Putin also said in a video address that Russia will not call up additional reservists or send in conscripts to fight the war in Ukraine, saying it will be fought only by professional soldiers.

"The tasks are solved only by professional military personnel," Putin said. "I am sure they will reliably ensure security and peace for the people of Russia."

His comments came in a video message to Russia's women on International Women's Day, saying he understood the concerns of the "mothers, wives, sisters, brides and girlfriends of our soldiers and officers who are now in battle, defending Russia during a special military operation."

Some reports indicate that Russian conscripts have been pressured into signing professional contracts before being deployed into Ukraine.

-ABC News' Patrick Reevell

The U.N. Security Council met again this afternoon to discuss Russia’s war against Ukraine and the growing humanitarian crisis.

U.N. relief chief Martin Griffiths briefed the council, warning that U.N. agencies are being overwhelmed.

“Make no mistake. We are unable to meet the needs of civilians today,” Griffiths said. “We’re failing to meet the needs of civilians today at this time. I hope we will not fail them tomorrow.”

President Joe Biden’s envoy to the U.N. Linda Thomas-Greenfield said in the meeting that 100 Ukrainian refugees cross into Poland every minute.

Griffiths urged both sides to take “constant care to spare civilians and civilian homes and infrastructure,” including safe passage for civilians to leave war zones and allow aid to come in. He also said the U.N. was working with Russia to set up a humanitarian notification system to ensure aid can be delivered safely and at scale.

“Simply put, millions of lives shattered. People can’t stay home with shops shut, power and water cut, shells falling, phones switched off. They can’t find what they need, even if they have money to pay for it. And as we have seen, even as the TV cameras roll, many can’t flee in safety either in this conflict,” he said. “It’s been 11 days of escalating violence, fear, and pain.”

-ABC News’ Conor Finnegan

U.S. Secretary of State Antony Blinken crossed the border into Ukraine Saturday after meeting with Ukrainian Foreign Minister Dmytro Kuleba at the Korczowa Border Crossing Point.

"The entire world stand with Ukraine," Blinken said, and Kuleba added that he hopes Ukrainians will see this as a "clear manifestation that we have friends who literally stand by us."

Blinken said the sanctions imposed so far against Russia are "producing very, very concrete results" and that the pressure will "grow" until this "war of choice is brought to an end."

When asked directly about helping Kuleba with more firepower, Blinken said, "the support for Ukraine not only has been unprecedented, not only is going to continue, it's going to increase."

Kuleba said Ukraine "appreciates" sanctions that have been announced in the last week, but that more economic and political pressure and "necessary weapons," would "save many lives in Ukraine... many sufferings will be avoided."

Kuleba also said that they are “satisfied" with already arranged supplies of anti-tank weapons and ammunition, but that “it’s no secret” they still want fighter jets and air defense systems.

He also thanked the U.S. for sending stingers, and said they were used on Saturday.

"Just today we shot down three Russian attack aircrafts, which were bombing our cities with the use of stingers but we need -- so to say -- big air defense systems to ensure the safety of our skies. If we lose the skies, there will be much, much more blood on the ground,"Kuleba said.

In response to questions about NATO’s refusal to impose a no-fly zone over Ukraine, Kuleba said it’s a "sign of weakness," but stayed optimistic that they will change their minds.

"The time will come," he said.

-ABC News' Conor Finnegan and Justin Gomez