Clashes were underway Wednesday along several front lines in Yemen, claiming at least 42 lives and undermining a day-old cease-fire and peace talks between the internationally recognized government and Shiite rebels taking place in Switzerland.

The U.N.-brokered talks that began Tuesday were meant to give Yemen’s warring factions a chance to find a solution to the conflict that has engulfed the Arab world’s poorest country.

At the same time, an agreed-on cease-fire went into effect on the ground, meant to last a week. But as fighters on both sides ignored the truce, expectations for the negotiations were low. […]