

Flight from Ulanbaatar to Beijing -- 2 days stop in Beijing -- flight from Beijing to Moscow
Hello,
we are 2 Slovak citizens traveling from Ulaanbaatar to Beijing (arrival to Beijing on 12 September 2019 in the evening) and then from Beiging to Moscow (departure from Beijing on 15 September 2019 at 5:50am). We have purchased both flight tickets independently and they are operated by different airlines.
1. Can we use visa free transit in Beijing? Is area of Great Chinese Wall still covered by visa free transit?
2. Where do we have to apply for visa free access? Still at the airport in Ulaanbaatar (before entering the China) or we can do so also at the airport in Beijing?
3. Can we rely on possibility to use visa free transit, or it is always more safe to ask for visa - even if Slovakia is a qualified country and we both fulfill 72 hours stay criterion.
Many thanks and best regards,
Rudolf