After Venezuela, who is next? Greenland?

NewsNation National Correspondent Robert Sherman has found himself on the frontlines of some of the world's biggest stories: from Ukraine to Israel and across the U.S. He shares what he's seeing on the ground.

After Venezuela, who is next? Greenland?

Good afternoon from Puerto Rico.

It's a fast-moving world we live in. The dust is still settling from Saturday's operation in Venezuela, but the president has made several comments indicating that may not be the end of it.

As we have reported on in the past, the Pentagon wants to restructure its focus abroad. Less emphasis on Europe, with the hope European nations take more responsibility for their own defense, and a more hands-on approach to the Western Hemisphere.

That's why there are currently 15,000 troops and personnel in the Caribbean.

But look north for another potential place the president has his eye on: Greenland.

"President Trump has made it well known that acquiring Greenland is a national security priority of the United States, and it's vital to deter our adversaries in the Arctic region," White House press secretary Karoline Leavitt told NewsNation in a statement. "The President and his team are discussing a range of options to pursue this important foreign policy goal, and of course, utilizing the U.S. Military is always an option at the Commander in Chief's disposal."

The White House has not been bashful about its interest in Greenland, viewing the Arctic as a highly strategic new frontier that China and Russia are already sprinting to bolster their footholds in.

To be clear, interest in Greenland and the Arctic extends well before the Trump presidency, but never has an American president so boldly tried to stake a claim.

The response from Danish Prime Minister Mette Frederiksen? "If the United States decides to military attack another NATO country, then everything would stop -- that includes NATO and therefore post-World War II security."

Then there's Colombia, which the President called out by name and accused of playing a role in sending drugs to the U.S.

"Colombia is very sick too. Run by a sick man who likes making cocaine and selling it to the United States," The President said Sunday on Air Force One. "And he's not going to be doing it for very long, let me tell you."

Gustavo Petro, Colombia's president, issued a sharp response in defiance: "Come and get me," he said in a press conference.

And then there's Cuba as well, in which the president said he believes won't require any U.S. military action — contending without Maduro and the Venezuelan regime, the money will stop flowing to Havana quickly.

"Cuba always survive because of Venezuela," the president said. "Now, they won't have that money coming in."

Hold on. The geopolitical map is changing quickly.

AN UPDATE ON LESSONS FROM THE FRONT

We just heard from Bloomsbury today, and they are back in stock of my book, "Lessons from the Front." Amazon just received a big shipment as well.

This project became an Amazon Best Seller, and the demand has far exceeded all of our models.

For my Hoosier family, you may have caught my interview in West Lafayette this week with Drew Cosgray. We'll have a media blitz in the coming days (breaking news permitting).

Thank you for all of your support. More to come from across the globe soon.