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Determine whether the sequence is arithmetic. If so, find the common difference.
Crimean Peninsula
A major land mass on the northern coast of the Black Sea that is geopolitically significant and was annexed by Russia from Ukraine in 2014, leading to international controversy.
Russia
The largest country in the world by land area, spanning Eastern Europe and northern Asia, known for its rich history, cultural heritage, and political influence.
United States
A federal republic in North America composed of 50 states, a federal district, five major self-governing territories, and various possessions.
Economic Sanctions
Financial and trade penalties applied by one or more countries against a targeted country, group, or individual to influence behavior or politics.
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