Prime Minister Eduard Heger said his government "decided and unanimously approved" an international agreement on the donation, the Reuters news agency reported.
"The process of handing over these fighter jets is closely coordinated with the Polish side, with Ukraine and, of course, with other allies," he added, as quoted by Reuters.
Slovak gov't 'approved sending 13 MiG29s to Ukraine': PM
Heger said in a tweet on Friday that the Slovak government "just approved sending 13 MiG-29s to Ukraine."
He added: "Promises must be kept, and when Ukrainian President Volodymyr Zelensky asked for more weapons, including fighter jets, I said we’ll do our best. I'm glad others are doing the same. Military aid is key to ensure Ukraine can defend itself and Europe against Russia."
A day earlier, Poland became the first of Kyiv's allies to pledge such aircraft, Polish state news agency PAP reported.
Polish President Andrzej Duda told reporters on Thursday that his country would provide Ukraine with four MiG-29 fighter jets "in the coming days."
Both Poland and Slovakia are NATO members. They both neighbour Ukraine.
Friday is day 387 of Russia’s war against Ukraine.
Source: IAR, PAP, Reuters