Ukrzaliznytsya has opened ticket sales for Uzhgorod-Kyiv train starting June 4

Ukrzaliznytsya has opened the sale of tickets for 6 trains in the western direction, which will start running on June 4. 
In particular, ticket sales are open for the train №29 / 30 Kyiv-Uzhgorod (daily, from Kyiv – from June 4, from Uzhgorod – from June 5). 
With these trains, ticket sales for 35 long-distance trains have already been opened. 
According to the resolution of the Cabinet of Ministers №392, ticket sales are open for 50% of seats on trains. Tickets can now be purchased through the company’s official website and at the box office. 
Passengers will be let into trains only if they wear protective masks. Temperature screening will be performed during ticket check. 
Selling food is currently banned on trains. In night trains, conductors will only be able to offer bottled water. 

Starting June 1, the Ukrzaliznytsya will be selling tickets 90 days before the train departure date, instead of 45 or 60 days as before. 

Source.