International Law has itself helpless as many a times it seems that it is not enforceable. The International Court of Justice, that should be a truly empowered international judiciary is however not anywhere near to its expected role. Even the decisions of ICJ are not binding upon the member states. They can implement its decisions in their own good faith.
To implement its verdicts, the United Nations can sometimes use force through the approval / sanction of UN Security Council but that too is a difficult task when it comes to vested interests of the veto powers. This is because to decide on any substantive (major) matter, all the five veto powers should cast their vote in favor of it. Apart from these five permanent members, 9 out of 15 temporary UN Security Council Members also must vote in favor of that matter. So getting such a majority often seems difficult even in the most devastating matters where mankind and human rights are being severely violated. For example, the matter of Kashmir dispute remains unsolved due to the differences in interests of the UN Security Council Members.
Therefore the only feasible way left to enforce the International Law is by enforcing economic sanctions. This too also needs the support of the world-wide community to succeed. Otherwise the Executive and the Judiciary in International Law are powerless.