What promise (s) do both sides make in Article 5?

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Treaty of Nonaggression Between Germany and the Union of Soviet Socialist Republics

What promise (s) do both sides make in Article 5?

Answer: To solve disputes or conflicts between them exclusively by negotiation or arbitration.

Explanation:

Signed on August 23, 1939, by Ribbentrop and Molotov, with Stalin also present, the pact also stipulated not attacking each other, nor support other's attack upon the other party, to keep open consultation about their common interests, and not joining others directly or indirectly menacing the other one.