https://www.dailymail.co.uk/wires/afp/article-7176361/Mexico-cracks-US-border-15-000-troops.html

Mexico has deployed nearly 15,000 soldiers and National Guardsmen to its border with the United States, the army chief said Monday – admitting they are detaining migrants who try to cross, after the policy triggered backlash.

Under pressure from US President Donald Trump to slow the surge of Central Americans crossing the border, Mexico promised earlier this month to reinforce its southern border with 6,000 National Guardsmen, but had not previously disclosed the extent of the crackdown on its northern border.

"We have a total deployment, between the National Guard and army units, of 14,000, almost 15,000 men in the north of the country," Defense Minister Luis Cresencio Sandoval said at a press conference alongside President Andres Manuel Lopez Obrador.

The deal, struck on June 7, gives Mexico 45 days to show results.

https://www.atlanticcouncil.org/blogs/new-atlanticist/what-to-expect-from-acting-secretary-of-defense-mark-esper

As secretary of the army, Esper often made his purpose quite clear: to modernize the army and prepare it for the future of warfare, especially against near-peer challengers such as Russia and China. On May 17, Esper delivered a keynote address at the Atlantic Council’s Commanders Series on “The Future of the Army in Great-Power Competition.” According to Esper, Russian and Chinese military modernization has produced a new array of capabilities which complicate the longstanding US ability to amass combat power and seize the initiative. A US army oriented toward counterinsurgency in Iraq and Afghanistan is not sufficiently formidable to fight or deter Russia or China. Thus, just as it did after its failure in the Vietnam War, the United States must once again reorient from counterinsurgency to major-power conflict. How do these concerns guide Esper’s vision for the future of US defense strategy?

“We know from history that not preparing for war invites aggression, and that is a losing proposition,” Esper said at the Atlantic Council, echoing the ancient Latin aphorism “Si vis pacem, para bellum” (“If you want peace, prepare for war”). Thus, it is nearly certain that as defense secretary, Esper will continue to support modernization of the US military to better prepare it to win the next great-power war, so that such a war will never occur.

speech starts at 37:43