What he said
SVO-LED is like DFW-ORD. Nobody cares if you miss your flight, you catch the next one in an hour, two at worst.
Not sure I agree that you have plenty of time though. SVO immigration can take anywhere from 10 minutes to two hours. Before you is the Ulaan Baatar flight and if your flight is late, you will arrive after the Tehran and Seoul flights. That is a recipe for a 2hr immigration wait for sure. But don't worry. You'll make it to LED on the next flight anyway.