rides going north, it is not something that is all that uncommon unfortunately here in mexico. this accident comes not long after a report released by the international organization for migration which said that at least 650 migrants crossing the southern border from mexico to the united states died in the last year. that's the largest such number since 2014. this accident in southern mexico just a stark reminder of how dangerous the journey can be just getting to that southern border. christine and laura? >> all right, matt, thank you for that. a's by i day of working the phones for president biden. the president reassured ukraine's president zelensky that the u.s. has his back as ukraine tries to fend off a russian invasion. mr. biden also held a separate call thursday with the bucharest nine, a group of nato members on europe's eastern edge near russia. let's go live to kiev with cnn's matthew chance. did president zelensky hear everything he needed to hear from president biden? >> reporter: well, i mean, publicly the ukrainians are