If I try to tell my daughter what to do and boss her around, it is usually counterproductive and she is more likely to do the opposite. Some people don't like to be told what to do.
Nations can be that way too. Do we really think that President Barack Obama's warning to Russia not to intervene in Ukraine will be effective? For decades Ukraine was part of the USSR and was as closely connected to Moscow as California is to Washington. Ukraine is certainly within a legitimate sphere of Russian influence.
All our talk may make us feel good and powerful in world affairs, but if it has any effect at all, it can only be counterproductive. That is, our threats won't help Ukraine and can only worsen our poor diplomatic relations with Russia.
Sometimes it's better to keep your mouth shut, tempting though it is to open it.
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Daniel Hoyt Daniels