Original sentence: It has been argued that the J-10 is based on the Israeli Lavi, which in turn was developed with American assistance.So severe was the incident, that Israeli participation in the F-35 program was thrown in jeopardy
Edited sentence: It has been argued that the J-10 is illegally based on the Israeli Lavi, which in turn was developed with American assistance.So severe was the incident, that Israeli participation in the F-35 program was thrown in jeapardy