A day earlier, Poland's Foreign Minister Radosław Sikorski met in Warsaw with the US special envoy for Belarus, John Coale.
In recent months, several groups of Belarusian political prisoners have been freed with the involvement of US diplomats, though Poczobut had not been included in those earlier releases.
The US ambassador to Poland, Tom Rose, took to X on Tuesday to praise Coale's "determined diplomacy," saying that Poczobut "is now free from detention in Belarus and can once again embrace his family."
"America delivers for its friends and allies," Rose wrote.
"Our partners in Poland worked side by side with us to secure his release," he added. "We appreciate the incredible work of the Polish special services and Ministry of Foreign Affairs to get this done. That is what real partners do."
Poczobut, a prominent member of Poland’s minority community in Belarus and a longtime contributor to Polish media, was arrested by Belarusian authorities on March 25, 2021.
In February 2023, he was sentenced to eight years in a high-security penal colony on charges widely condemned as politically motivated.
According to Belarusian state news agency Belta, the release took place as part of a prisoner exchange at the border, with five detainees handed over by each side.
Belarusian authorities said Poczobut was released in response to a personal appeal from his mother to President Alexander Lukashenko, as well as mediation efforts by Polish minority leader Andżelika Borys.
Poczobut had repeatedly faced arrest and prosecution in Belarus for his criticism of Lukashenko and his reporting on political developments in the country.
Authorities accused him of "rehabilitating Nazism"—charges linked to his activities promoting Polish culture and publishing articles.
His appeal was rejected by Belarus’ Supreme Court, and he had been held in a penal colony in the city of Novopolotsk.
Human rights organisations had designated Poczobut a political prisoner, and Polish officials had long called for his release and the dismissal of what they described as false charges.