The documents - while up to several months old - offer detailed insights into which Russian intelligence agencies have been most compromised, and clues as to how the United States has gleaned so much secret Kremlin information.
With the coronavirus pandemic disrupting traditional campaigning, candidates and supporters are increasingly turning to social media to reach voters, prompting concerns about online hate speech and disinformation.
Pentagon officials are said to be launching a huge probe into the leak. The leaked documents shared online - at least some of which are believed to be genuine - consist of photographs of printed sheets of paper.
He had initially vowed to stay put in Kyiv despite the constant blaring of air raid sirens and attacks on residential buildings, but decided to leave after hearing reports of Russian soldiers 'raping' Ukrainian women.
Moscow has not concealed a programme under which it has brought thousands of Ukrainian children to Russia from occupied areas, but presents this it as a humanitarian campaign to protect orphans and children abandoned in the conflict zone.
While the breach underscored America's ability to infiltrate Moscow's upper echelons, it has also sparked fears that Russian intelligence may now have a clearer understanding of exactly what the US does and does not already understand, providing an opportunity to cut off sources of information.
Russia has already accused the West of using its civilian space infrastructure to support the operations of the Ukrainian troops, including for combat strikes, and detecting the locations of Vladimir Putin's army and its movements.
Aric Toler, head of research and training at the Bellingcat investigative consortium, said Saturday that the photos were posted by the Thug Shaker Central on Discord, but DailyMail.com was unable to find the group on on the platform Saturday.
March 19 (Reuters) - The Philippines´ presidential candidates debating on Saturday agreed on at least one thing and that was the need to hold social media firms liable for the spread of disinformation as the country prepares for elections on May 9.
The group helped the Ukrainian relatives of children who had been taken to Russia with the logistics, transport and planning needed to embark on the long journey to fetch their children and bring them back.
In Ukraine, algebra math tutors the documents suggested a misalignment between US and Ukrainian military strategies, with intelligence reports appearing to show the US continues to spy on top military and political leaders in the region.
Three children - two boys and a girl - were present at the media briefing in Kyiv.
Save Ukraine said they were returned to Ukraine on a previous rescue mission last month that returned 18 children in total.
Toler, whose investigative consortium has done several probes of Russian intelligence operations, said he believed he had traced the posting back to Thug Shaker Central on Discord, which was then reposting by users to a bigger group.
Lvova-Belova told a news conference earlier this week that her commission acted on humanitarian grounds to protect the interests of children in an area where military action was taking place and had not moved anyone against their will or that of their parents or legal guardians, whose consent was always sought unless they were missing.
And the US also learned that South Korea was nervous about arming Ukraine, suggesting the CIA is receiving information from foreign diplomats about high-level private chats taking place among their governments.
Allied nations, such as South Korea, have also reportedly been the subject of spying by the Pentagon, raising questions as to the diplomatic impact the leak could have at a time of deteriorating global ties.
A grandmother who had been due to reunite with two of her grandchildren died suddenly on the trip and the children had to remain in Russia, Kuleba, Ukraine's former commissioner for children's rights, told a media briefing in Kyiv.