Online English classes, with Serbs and Croats in Croatia, are being offered to people from around the world in the hope that some will improve their English skills.
The programme aims to provide free lessons in the English language, and is part of the International Programme for the Teaching of English in Serbs.
In a joint statement on the initiative, the two countries said they were “ready to offer” the courses.
The statement came as a result of a letter from the Croatian government to the Croatian parliament, which is trying to find a solution to the problems of Serbs in Croatia.
“The Croatian authorities have made it clear to the authorities in Serbia that if the Croatian authorities don’t help us in this, we will make the solution ourselves,” the letter said.
“In case we don’t get an answer, we would like to offer this service to the Serbian people as a contribution to our national dialogue.”
Serbs have been living in Croatia for centuries, but many have been forced to leave after the 1990s civil war that left millions of Serb refugees in the former Yugoslavia.
Croatia has become increasingly frustrated by the situation and has been trying to force Serbs to return to the country.
But in June, Croatian Prime Minister Zoran Milanovic announced a proposal that would see people of Serbian descent who live in Croatia pay for a Serbian language course.
The Serbian language, which has been in the hands of the Croats for more than 400 years, is one of the hardest to learn.
Serbs have said they want to learn the language to help them assimilate into Croatian society.
But some have said the language is not an essential part of Croatian culture, and the Croatian education ministry said in a statement that it has decided to allow courses in Croatian.
In June, the Croatian minister of foreign affairs said he had received a letter of complaint from the Serb government of Croatia over the proposed Croatian language courses.
“Croatians must understand that our country has been a member of the EU for almost 200 years, and that its national language is the language of our people,” Milovanovic told journalists.
“The Croatian language must be respected.
We must also respect Croatian culture.”