As i understand it, if they are civillian forces then no. They only have rights to international assistance of any jurisdictively relevant body if they are party or signatory to the maritime treaties laws and acts and those specifically state that if they are non protected personnel (under the UCOMJ, foreign agents, civillian forces of a government and or diplomats protected by their DI) then they cannot be freed from such situations.

However if it could be proven that the Somalian government was capable of freeing them and wasn't and or negligent or giving them save haven in those waters or their land air or high seas then any of those nations could come in and free the hostages under the safe havens treaties passed in the UN after 9/11 or if any nation may seek the capture of those who have seized the vessel (in this case the pirates), then they shall be allowed to again, use the seize and capture clause to either seize or kill them. If that is, they are signatory to the safe Havens treaties themselves.

Hope that helps explain it a little!