https://www.seat61.com/Russia.htm#Visas
" No problems have been reported using the direct trains from Paris, Berlin or Warsaw to Moscow via Belarus in 2017 or 2018."
"When leaving Russia, travellers report that they simply showed the Belarus entry stamp that they received at Brest when they entered to the Belarus-Russia unified customs area, and that seems to satisfy the Russian border staff when you leave Russia."
原本行程:
6-8 July. Flight from HK> SVO > Minsk
8-9 July. Night train/Buses from Minsk to Kiev
12-13 July. Night train/Buses from Kiev to Minsk
14 July. Flight from Minsk > SVO > HK
Dear Sir/Madame,
The 14-day visa free agreement between Belarus and Hong Kong is in effect and applies regardless of your route, so your itinerary does qualify you for visa free stay in Belarus.
Border control officers might ask you to present your travel insurance policy. You may purchase it beforehand (in English) or at the Minsk airport.
--
Best regards,
Sergei Vereiko,
Embassy of the Republic of Belarus."
白俄羅斯有免簽，白羅斯冇喎～～