Secretary of State Marco Rubio met with Greek officials this week to discuss shared security challenges.
The talks focused on migration and counterterrorism cooperation between the two nations.
Rubio praised Greece for increasing its defense spending in recent years.
He said Greece has become a reliable partner in regional stability efforts.
The secretary also urged Greece to address what he called mass migration concerns.
U.S. officials view the migration issue as a growing security threat in the region.
Both countries agreed to deepen intelligence sharing and military coordination.
The meeting signals continued U.S. engagement with European allies on security matters.
