Asimilarity between tariffs and sanctions is that both are sometimes used to?

“Punish other nations”, is the right answer.

Explanation:

Tariffs and sanctions are the two different ways to do the same job. Tariffs are taxes on imports, for instance, tariffs that China placed on U.S. corn, it implies that anyone who desires to buy the American corn has to pay more charges to get it. At the same time, "Sanctions" are means to punish a country by preventing the sale or the purchase of something of that country, for instance, U.S. sanctions on the oil from Iraq. Therefore, both the methods are employed to punish a nation and make it more difficult to make trading deals with that nation.