Yes, the process of trademark invalidation review is also infringement. You can sue the other party for infringement, but you must collect evidence to prove that the other party does have trademark infringement. According to the relevant provisions of Article 52 of China's Trademark Law, if the registered trademark of the other party is similar to its own trademark, it is an infringement to use the registered trademark without permission or cause damage to its exclusive right to use the registered trademark. Article 52 of the Trademark Law of People's Republic of China (PRC) commits any of the following acts, all of which are infringement of the exclusive right to use a registered trademark: (1) using a trademark identical with or similar to its registered trademark on the same commodity or similar commodity without the permission of the trademark registrant; (2) selling goods that infringe upon the exclusive right to use a registered trademark; (3) Forging, manufacturing or selling the forged or manufactured registered trademark logo without authorization; (4) Changing its registered trademark without the consent of the trademark registrant, and putting the goods with the changed trademark on the market; (5) causing other damage to the exclusive right to use a registered trademark of others.