1)Tariff: A tax on imports. Tariffs raise the price of imported goods relative to domestic goods (goods produced at home). 

2)Subsidy: It is a government subsidy to a particular domestic industry. Subsidies make those goods cheaper to produce than in foreign markets. This results in a lower domestic price. Both tariffs and subsidies raise the price of foreign goods relative to domestic goods, which reduces imports. 

3)Embargo :- A blockade or political agreement that limits a foreign country's ability to export or import. 

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Yes there will be more stiff competition and more caos on their respective goods.