The Defense Department has raised its counterintelligence threat assessment to the highest level.
Israel is believed to have eavesdropped on sensitive American negotiations with Iran.
The shift reflects growing concerns within the Pentagon about espionage activities linked to a key ally.
Intelligence officials have identified Israel as an increased source of espionage risk.
This marks a significant change in longtime security assumptions between the two nations.
The department has implemented new security measures in response to the elevated threat.
Officials say the monitoring targeted high-level diplomatic talks, raising alarm across U.S. security agencies.
The situation underscores the complexity of managing allied intelligence relationships.
