While Ukraine’s official song entry, “Heart of Steel” by the electronic music duo Tvorchi, may not feature explicit lyrics about Russia’s invasion, the duo has said the song was inspired by the courage of Ukrainian defenders in the Azovstal steel plant during the siege of the southern city of Mariupol.

“Sometimes you just gotta know/ When to stick your middle finger up in the air,” the vocalist Jimoh Augustus Kehinde sings at the top of the song.

Last December, Tvorchi performed the song in Kyiv with background dancers wearing gas masks while images of nuclear hazard signs played on large screens behind the stage.

Let 3’s “Mama SC!” is Croatia’s official entry and though many of its lyrics seem like nonsense — “Mom bought a tractor!” “Mom kissed a moron!” — it also refers to “going to war” and an “evil little psychopath.”

The tractor references are being read by some on social media and Eurovision blogs as allusions to a 70th birthday gift from President Aleksandr G. Lukashenko of Belarus to his counterpart in Russia, Vladimir V. Putin: a Belarussian-made farm truck.

Let 3, known in Croatia for its social commentary and garish costumes, performs the song using what appeared to be nuclear rockets as onstage props.

Switzerland’s entry, “Watergun” by Remo Forrer, is unapologetically an antiwar tune. “I don’t wanna be a soldier, soldier,” Forrer sings. “I don’t wanna have to play with real blood.”

Explaining the message of that song for a promotional video in Eurovision’s website, Forrer said, “We are currently faced with global crises and war. And we must live with the consequences of decisions we didn’t make. But I still hope we can change things.”

In previous years, Eurovision has been less forgiving of entries with politically charged lyrics. Belarus was ejected from the competition in 2021 after critics said the song it had entered endorsed a violent crackdown on antigovernment protests that year by Mr. Lukashenko.