Economic embargos such as those launched by the US against Russia may seem relatively harmless. They are not. Trade sanctions are a form of strategic warfare that is sometimes followed by bullets and shells.
Think, for good example, of the 1940 US embargo against Japan that led Tokyo's fateful decision to go to war rather than face slow, economic strangulation. How many Americans know that President Roosevelt closed the Panama Canal to Japanese shipping to enforce demands that Tokyo get out of Manchuria and China?
Frighteningly, today, there are senior officials in Washington and Moscow who are actually considering a head on clash in Ukraine between Russian forces and NATO ? which is an extension of US military power.