Mark Burnett and President-elect Donald J. Trump had a long and successful collaboration that made Mr. Trump a household name.

© Evan Vucci/Associated Press

After fiber-optic cables under the Baltic Sea were cut last month, European officials hurried to stop the Yi Peng 3. It’s still at anchor there, with no update on three nations’ investigation.

Readers discuss the British vote on the issue and urge actions in the U.S. Also: Safeguarding our food; taxing cow burps in Denmark; a crossword tale.

Multiple countries are investigating and the authorities in Europe say they have not ruled out sabotage. But U.S. intelligence officials have assessed that the cables were not cut deliberately.

Another Trump term could spur Europe’s efforts to stand on its own, but it is far from clear its leaders will seize the moment this time.