The war in Ukraine provided a lot of training for the Mexico cartel members. Plus, a lot of the weapons ended up just south of the US border in the hands of cartels, being smuggled from Ukraine.

US politicians, not to mention the CIA, knew that, so this is no surprise. They also elected  Sheinbaum as President of Mexico, to make sure the chaos would take place. Prior to Mexico's June 2, 2024 elections, 37 candidates, mostly in local elections, were assassinated, so she could win.