Embargoes is correct.

Per Lundborg has written:

'The economics of export embargoes' -- subject(s): American Economic sanctions, Econometric models, Economic aspects of Embargo, Embargo, Grain trade

They can proclaim embargoes and sanctions, but the UN has no military forces; military forces have to be provided by nations. The nations involved can enforce the sanctions or ignore them, or anything in between. If some nation wants to enforce sanctions and embargoes, and another nation wants to evade these actions, then there's a potential for military conflict.

For example, if the UN were to impose sanctions on Russia and an embargo on Crimea, any attempt of the USA to enforce embargo would likely lead to conflict. That's why Barack Obama has proposed only incredibly tiny and ineffectual sanctions on Russia; Vladimir Putin wouldn't stand for it. With the rapidly declining American military and the expansion of Russian military might, if push came to shove, the USA would suffer an embarrassing defeat and humiliation. And both Putin and Obama know it.