Captain, There is no such thing as an International Patent.
This is simply an international application published under the patent cooperation treaty (PCT) which is managed by the World Intellectual Property Organization (WIPO) based in Geneva, Switzerland.
It is kind of a mailing box to reach the 133 states signatories + [ARIPO (Africa); Eurasian; European; OAPI(Americas)] Regional Protection and hence establish priority claim. It is similar to the one used for LR-EtEPA.
Amarin must then designate the countries and regions it wants to reach within a certain deadline (for most 31 months; for Europe 32 months) and initiate the process of applying for patent protection with them.