What factors led to Russias war/proxy war in Ukraine?

Viktor Yanukovych suspended preparations for the implementation of an association agreement with the European Union. The backlash from the proponents of the agreement was massive.

president thomas jefferson hoped that the embargo act of 1807 would the united states by demonstrating to britain and france their dependence on american goods, convincing them to respect american neutrality and stop impressing american seamen. instead, the act had a devastating effect on american trade.