China has a significant interest in disrupting western control and does so without provoking direct open war by funding Iran’s funding of destabilizing forces (Houthi, hezbollah, taliban, Isis, hamas).
Perhaps, but isn't the Suez Canal the only reasonable way to ship bulk goods between Europe and Asia? Doesn't China depend heavily on access to the European markets that these attacks disrupt? I would think that that would outweigh their other interests here.
