An ECHR judgement applies to all signatory nations of the Convention.
The accord forbids the five signatory nations to allow insurgent groups to use their territories for cross-border attacks.
Nearly all 200 countries of the world are "signatory" nations, in that they have ratified these conventions.
The Chemical Weapons Convention is a global treaty with more than 170 signatory nations.
In addition, Pakistan was one of the 67 signatory nations opposing the UN declaration on sexual orientation and gender identity, which failed to pass.
Officials of the United Nations Environment Program expressed hope that by the middle of next year, at least 20 signatory nations will ratify the treaty.
The Conventions apply to all cases of armed conflict between two or more signatory nations, even in the absence of a declaration of war.
Originally limited to nine signatory nations, over 40 are now signatories of the treaty.
Switzerland, the official depository of the Conventions, is now sounding out the 191 signatory nations to see whether there is enough support for the change.
Proponents say U.S. ratification would set an example for the other 150 signatory nations.