The Latest Breaking News from Pentagon

The Pentagon has said it has launched an investgation into the leaked documents, which also included nationally sensitive material on China and the Middle East as well as Ukraine.

A recent leak of U.S. classified intelligence reports appears to confirm what many Latin America and Caribbean watchers have warned about in recent years: Russia and China are trying to gain a foothold amid waning U.S. leadership.

The Pentagon says online leaks of scores of highly classified documents about the Ukraine war present a “very serious” risk to national security and senior leaders are quickly taking steps to mitigate the damage

WASHINGTON — “Highly classified sensitive” information that poses “a very serious risk to national security” was made public in a leak of documents that provide details of U.S. spying on other countries, including an assessment of weaknesses in Ukraine’s military, according to the Pentagon.

Disclosure already represents worst national security breach in years, and analysts suggest damage to US could get worse

US officials race to verify intelligence cache and work out who posted it online

Catch up on key developments and the latest in-depth coverage of Russia's invasion of Ukraine.

The Justice Department has opened a criminal investigation into the leak of highly classified Pentagon documents that revealed how the U.S. spies on other countries, including an assessment of weaknesses in Ukraine’s military.

US officials are searching for the source of a security breach as highly classified documents were allegedly leaked over the past few weeks on social media platforms. Showing war-sensitive details on Ukraine's military defences as the embattled nation prepares to launch a counteroffensive against Russian forces, the documents drew international…

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U.S. national security agencies are reviewing how they share their most sensitive secrets inside the U.S. government, and dealing with the diplomatic fallout from the release of dozens of confidential documents, three U.S. officials said.