Nearly one year after mysterious drones hovered near a top-secret military base in Virginia for 17 days, Sen. Tim Kaine says he is "very frustrated" with "so many unanswered questions" that remain. 

The Virginia Democrat said his state delegation will get a classified briefing on the situation Thursday. 

For more than two weeks in December 2023, the mystery drones flew into restricted airspace over the installation, home to key national security sites and the F-22 Raptor stealth fighters. 

The Pentagon has said little about the incidents other than to confirm they occurred after a Wall Street Journal report in October. If officials know where the drones came from or what they were doing, they haven’t shared it with Congress.

Nor likely will they.

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