The United States and Britain carried out large-scale military strikes on Monday against eight sites in Yemen controlled by Houthi militants‚ according to the two countries. The strikes signaled that the Biden administration intends to wage a sustained and‚ at least for now‚ open-ended campaign against the Iran-backed group that has disrupted traffic in vital international sea lanes. The strikes — the eighth in nearly two weeks — hit multiple targets at each site‚ and were bigger and broader...