There is a machlokes among the Poskim if this is considered "creating" a new vessel on Shabbos, which is forbidden, as opening the cap and breaking the ring creates a new lid that can be repeatedly opened and closed. While Reb Shlomo Zalman Auerbach zatzal did permit this, he also recommends opening all bottles before Shabbos when possible. If a bottle needs to be opened on Shabbos the ideal way to do it is to first poke a hole in the cap so it is unusable, and then unscrew it. This way one never creates a usable vessel.