Angelina Jolie issued a stark warning about how children will be most affected by Russia's ongoing invasion of Ukraine.

Jolie, who serves as special envoy for the UN High Commissioner for Refugees (UNHCR), took to Instagram on Tuesday with a message about what's to come if the war doesn't come to an end.

"As well as the millions who’ve fled over Ukraine’s borders, nearly 2 million people are displaced inside their country, many trapped by fighting, denied access to aid, and in direct physical danger. Without an end to the war children will pay the highest price – in trauma, lost childhoods and shattered lives," the actress and humanitarian wrote.

Special Envoy to the United Nations High Commissioner for Refugees Angelie Jolie has spoken out in support of Ukrainians.

Special Envoy to the United Nations High Commissioner for Refugees Angelie Jolie has spoken out in support of Ukrainians. (AP)

Jolie's post included a carousel of photos showing Ukrainian refugees – some crossing the river fleeing Irpin – and those still stuck in the country, sick and fighting for their lives in hospitals and bomb shelters.

ANGELINA JOLIE ON RUSSIA-UKRAINE WAR: 'I’M PRAYING FOR THE PEOPLE'

Jolie, 46, previously shared a message of prayer on February 25 for the citizens of Ukraine.

Ukraine

A Ukrainian serviceman holds a baby crossing the Irpin River on an improvised path under a bridge that was destroyed by a Russian airstrike, while assisting people fleeing the town of Irpin, Ukraine, on Saturday, March 5, 2022.  (AP/Vadim Ghirda)

"Like many of you, I’m praying for the people in Ukraine," Jolie said in the statement. "My focus along with my @refugees colleagues is that everything possible is done to ensure the protection and basic human rights of those displaced, and refugees in the region."

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"We have already seen reports of casualties and people starting to flee their homes to seek safety. It is too soon to know what will happen, but the significance of this moment – for the people of Ukraine, and for the international rule of law – cannot be overstated."

She also shared a link to a statement from the UNHCR that reads, "We are gravely concerned about the fast-deteriorating situation and ongoing military action in Ukraine."

Angelina Jolie arrives at the British Academy of Film and Television Awards (BAFTA) at the Royal Albert Hall in London, Britain, February 18, 2018.

The actress shared a prayer for the people of Ukraine in late February, one day after Russia first invaded Ukraine. (Reuters)

"The humanitarian consequences on civilian populations will be devastating," the statement continues. "There are no winners in war, but countless lives will be torn apart."

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