Government Looking for Leaker in Ukraine Documents Probe
breach. The U.S. government is treating the apparent disclosure of classified material surrounding the war in Ukraine as an insider's leak, but hasn't yet homed in on key suspects for a massive intelligence breach.

WASHINGTON - The U.S. government has treated the apparent disclosure as a serious matter.
The war in Ukraine has produced a lot of classified information
People familiar with the situation say that it is an insider leak. However, they have not yet identified key suspects.
massive intelligence breach
This has revealed the difficulties of protecting sensitive U.S. data and put America's ties with its closest allies to test.