Ukraine's government on Sunday allocated 16.6 billion hryvnia ($592 million) to guarantee the continuation of flights through Ukrainian airspace.

Prime Minister Denys Shmygal said on social media that the funds "were allocated to ensure flight safety in Ukraine for insurance and leasing companies."

"This decision will stabilize the situation on the market of passenger air transportation and will guarantee the return to Ukraine of our citizens who are currently abroad," he said.

Ukraine's ministry of infrastructure has said earlier that the sky over Ukraine remains open, refuting reports about the closure of Ukraine's airspace.

The ministry also said the government is working to prevent risks for airlines. 

(With input from Reuters)