Dual citizenship would likely be of greater benefit to Ukrainians, who would get the right to work in Russia, where the salaries are higher and the opportunities are greater.
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I spoke to a lot of Ukies this summer. Working in Russia is a growing trend that Moscow has been encouraging for some time now. A more practical alternative to the vast majority of Ukrainians than getting a visa to the U.S., EU or Canada etc. Dual citizenship will only accelerate Ukraine economic ties to Moscow.
Ukraine already has a massive ethnic Russian population - 22 percent - and close to half the nation's 48 million people say they feel more comfortable speaking Russian than Ukrainian. Although people in the country's western half favor the Ukrainian language and tend to see Ukraine's future linked to the West, the eastern half's population leans more toward Russia.
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As the "war on terror" moves ahead I would not be surprised to see Ukraine Split into two parts by the end of the decade. One half being aligned with Moscow. As of this year EU is now at Ukraines western border. So far it is not clear how much impact this is going to have in the short term but I have my doubts about EU last much longer than the end of the decade if the world economy continues to slide.