UK
The UK FCDO has advised citizens not to travel to Israel

Britain’s Foreign Affairs, Nations Community and Development Office (FCDO) advised Israel against all trips due to an increase in the country’s military activities with Iran.
The recommendation covering Israel and Palestinian territory of the occupied Palestinian territory can be invalidable if individuals do not follow.
With the Israeli airspace being closed, the missiles have been released by both countries in recent days.
“The situation has the potential to deteriorate without warning, fast, fast and warning.” He said.