Forum Questions - Access
The best option for you is to file for the enforcement of visitation rights under the divorce agreement in the country where the children live. Even if the other country is bound by the Hague Convention like Israel, this Convention is of very limited use in enforcing visitation rights where there is no abduction involved.
Certainly, as under Israeli law you remain joint legal guardian with the mother, even though you are divorced, and she has custody. The Hague Convention will apply. Where visitation rights are infringed because of child abduction, the Convention is very effective in securing the children's return.
If the judgment awarding the mother custody does not deal with the issue of the father's access, then the mother is not under a legal obligation to make sure that visitation takes place. The right to actualize visitation lies in the father's hands, not the mother's. However, as Israeli law regards it being in the child's welfare to meet her father even if he lives abroad, it is preferably to try and reach agreement with the father regarding access in Canada, as well as in Israel. Ideally this can be done via negotiation without the father having to file for access (visitation) in the Israeli family court. However, should no agreement be reached, he will have no option other than to file for access. The door will still be open to reaching agreement , even after proceedings have commenced, and , failing this, the court will decide on the matter.
Regarding guaranteeing the child's return, the court has discretion on the matter. The custodial parent has no automatic right to financial guarantees.
File for access both in Israel and overseas in a Family Court in Israel. Your 'ex' will have to file a defence. You can ask the court to appoint a social worker to make a report and recommendations on the issue. In general courts in Israel recognize the right and emotional importance of a child having a relationship with both parents, and initially is likely to make this clear to a custodial parent who displays hostility towards respecting this, even at a preliminary hearing.