Sanctions evasion can leave trading partners with the advantage

How effective would sanctions be if many countries continued trading with China and other sanctioned states?

The reply distinguishes continued trade from its terms: working around sanctions can require less favorable agreements.

Continued trade under sanctions can require agreements on unfavorable terms. Russia's dealings with India provide the example in this exchange. India is described as using Russia's need for trading partners to secure terms Russia would otherwise reject. This distinguishes finding a buyer from preserving the seller's previous bargaining power.