Iraq is not the only country that has continued to produce chemical and biological weapons, despite signing and ratifying the BTWC. (Iraq signed the BTWC in 1972, but didn't ratify it until 1991, and then only as a condition of the Gulf War cease-fire agreement.) The international community has gathered evidence suggesting that Iran, Syria, Egypt, North Korea, Libya, Israel, China, and Russia also have continued to produce chemical and biological weapons, in violation of the BTWC.
Most of these countries have denied that they have continued to produce such weapons. Due to the nature of their closed societies, no one has been allowed in to inspect for chemical and biological weapons. Former Russian President Boris Yeltsin declared in 1992 that his country would destroy or convert to other uses its biological weapons research and production facilities. But since four bioresearch centers in Russia are still off-limits to outsiders, the rest of the world has no way of confirming that biological weapons are no longer a priority for Russian weapons research and production.