DB challenge: The Soviet-Czechoslovak border

Your challenge, should you choose to accept it, is to have the Soviet Union and Czechoslovakia share a border by the time of the former's dissolution with a POD no earlier than the 1935 treaty between the 2 countries. Bonus points if you get the Soviets to invade Czechoslovakia at some point.
 
Your challenge, should you choose to accept it, is to have the Soviet Union and Czechoslovakia share a border by the time of the former's dissolution with a POD no earlier than the 1935 treaty between the 2 countries. Bonus points if you get the Soviets to invade Czechoslovakia at some point.

Well, I just have to turn to OTL. Czechoslovakia split (dissolved) into the Czech Republic and Slovakia, and it had a border with the SU at the time (or was it a successor state, Ukraine? Would that count?), and had been (repeatedly) visited by the Red Army.
What do I win?
 
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