The Washington Post has a good look this morning at the consequences Britain could face from Brexit: it could be tougher to stop terrorists from entering the country, harder to keep strong sanctions against Russia, and more difficult to maintain strong military spending.

Why it matters: Britain is locked in on Brexit, with a departure date of March 29 — but it's not clear how many people who voted for Brexit knew it could lead to all of these consequences.

Between the lines: Here's why Brexit could lead to these outcomes, per policymakers and analysts interviewed by the Post: