Arrest
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At present, there is no ICC warrant for Netanyahu’s arrest. The ICC Chief Prosecutor in The Hague has only announced that his office intends to apply to the International Court for the arrest of Netanyahu, his Minister of Defence and specific leaders of Hamas. The application could take months to complete and make its way through the system . Also, there is no guarantee the Court will even issue a warrant.
If a warrant were issued in future the only countries that would be obliged to arrest any of the named persons would be countries who have signed onto Rome Statute. Germany is a signatory as is the UK, France and Canada. The US, Israel as well as Russia, China and a number of Arab states are not party to Rome Statute.
So yes, if a warrant is issued those guys would likely be arrested if they travel abroad to signatory states such as Germany.
Countries that signed the Rome Statute: