The battle for Venezuela is entering a crucial moment, and so are the risks for that nation, for America, and beyond.

On Tuesday Juan Guaidó, widely recognized as Venezuelan president, launched what he called the “final phase” of a months-long struggle to end the oppressive, chaotic and failed regime of Nicolás Maduro. Street scenes of armored vehicles plowing violently into Guaidó-supporting demonstrators soon followed.

It all started in the early morning hours, when Mr. Guaidó released a defiant video message from Carlotta airbase, at the heart of Caracas. “Today, brave soldiers, brave patriots, brave men devoted to the constitution have taken up our call,” he said, flanked by armed soldiers.

Veteran opposition leader and Mr. Guaidó’s mentor Leopoldo Lopez was there, too, seen in public for the first time since he was placed under house arrest in 2014. On Mr. Guaidó’s order the army has finally freed him, Mr. Lopez declared, adding that now “everyone should come to the streets, in peace.”

A peaceful regime change, though, is unlikely.

Mr. Maduro was anointed president in Havana shortly after his old boss, Hugo Chavez, died there in 2013. He now relies heavily on Cuban oppression experts, which, through allies in the Venezuelan military, have long propped up Mr. Maduro. Cuban support intensified in January, when America and 53 other countries squarely stood behind Mr. Guaidó’s constitutionally-based claim to the presidency.

Cuba isn’t alone. Russia, which often warns against anyone interfering in its “near abroad,” has no problem propping up hostile regimes in America’s backyard. “We’ll have military cooperation with whoever we want,” Mr. Maduro’s foreign minister, Jorge Arreaza, told United Nations reporters last week, confirming Moscow’s growing military support for his regime.

Mr. Arreaza dismissed as “fake news” my question about renewal of weekly direct flights between Tehran and Caracas. But a Mahan Air flight landed in Caracas last week, and consistent credible reports document tightened Iranian-Venezuelan terrorist ties and cooperation in arms and drugs trafficking.

With foreigners solidifying their support for the regime, and as a political stalemate settled since January, Mr. Guaidó knew time wasn’t on his side. Sources tell me concerns that an emboldened Mr. Maduro would soon move to arrest or otherwise stop him, prompted his Tuesday airbase video.

So what now?

Cuba employs direct command and control over the Venezuelan military, says Stratfor’s Latin America watcher, Reggie Thompson, but now units may start to switch sides. Then violence may well worsen as “security forces start to turn against each other,” Mr. Thompson warns.

Let’s face it: Venezuela was an unsustainable mess much before Tuesday. The currency is useless, food and medicine are scarce, and street violence rampant. A Venezuelan friend says cartels have started distributing United States currency, illegal inside the country, to ordinary citizens, so they can buy groceries. “These dollars aren’t given for nothing,” she said, indicating criminal gangs will only grow stronger.

All that, though, is nothing compared to what’s next. Unless either side can quickly shore up the entire military, street fighting is likely to become bloodier than ever. Heavy tanks and Russian-made air assets will come in.

Even if Mr. Maduro goes, chaos is likely to persist as Cuban-backed paramilitary gangs, known as “colectivos,” continue their violent activity.

President Trump was Mr. Guaidó’s initial and most powerful backer. As Vice President Pence tweeted Tuesday, “America will stand with you until freedom & democracy are restored. Vayan con dios! #FreeVenezuela.” Behind the scenes, Washington closely consults with Guaidó, though it’s unclear whether Tuesday’s move was coordinated.

While the administration maintains a military option, it’s unlikely to send troops to Venezuela. As in Syria and Afghanistan, Mr. Trump is more eager to pull troops from foreign engagement than dispatch them to new ones.

With two million refugees already out of Venezuela and more to come — soon reaching our doorstep — and with fear of spiked oil prices, America has an interest in turning Venezuela around. And for good. Expect more pressure to turn the majority of the army to Mr. Guaidó’s side.

The Trump administration, which so far has handled the crisis well, is now facing a major new challenge. For the Venezuelan people, meanwhile, it’s a do or die moment.

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This column first appeared in the New York Post.