Franklin Roosevelt actually said...

No vessel not proceeding under United States Naval or other United States authorized supervision shall enter or navigate the waters of the s...

All of the United Nations have been very much heartened by what looks to be a victory of major importance in the Egyptian-Libyan area.

A vessel entering or navigating the waters of the Buzzards Bay and Vineyard Sound Defensive Sea Area does so at its own risk.

The importance might be much greater than the extent.