The U.S. has the power to block the sale of hospital diagnostic, treatment equipment, cameras, electronics, and a vast array of products with copyrights in the United States, even equipment produced overseas with only one component in them which is of US copyright origin.
The U.S. can apply pressure on smaller countries which depend upon US aid to abstain from various trade acts with Cuba, like Bermuda, during
George W. Bush's occupation of the White House, when Bermuda had arranged to sell Cuba its old buses, and
Bush's Latin American tool in the State Department, Roger Noriega applied pressure on them by informing them selling Cuba the buses would lose them financial assistance from the States, and they backed out of an important purchase for the people of Cuba.
A young boy in Cuba entered an art contest sponsored in another country, in the last few years, won one of the categories, went to that country to claim his prize and participate in the official activities, and was awarded a camera which just happened to have a U.S. American component, and he was immediately made to know he couldn't accept it.
When he got home, his country awarded him a very nice camera of a different brand.
Do you recall the incident in Mexico City in which the Sheraton Hotel was forced to throw out Cubans meeting U.S. American delegates who were meeting them there for discussions? We discussed it at length here at D.U. when it happened. Here's a quick recount from Wikipedia:
Law of Protection of Commerce and Investments from Foreign Policies that Contravene International Law
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The Law of Protection of Commerce and Investments from Foreign Policies that Contravene International Law (Spanish: Ley de Protección al Comercio y la Inversión de Normas Extranjeras que Contravengan el Derecho Internacional) is the law passed by the government of Mexico in response to the Helms-Burton Act, a United States federal law. The Helms-Burton Act, passed in March 1996, was designed to strengthen the United States embargo against Cuba.
The law was published on October 23, 1996 in the Official Journal of the Federation during the Ernesto Zedillo administration. In its first article, this law explicitly prohibits individuals or organizations, whether public or private, that are within the borders of Mexico from participating in any action that affects commerce or investment if those acts correspond to the application of laws of foreign countries.
Sheraton Hotel incident
The first instance of a violation to this law happened almost ten years later when employees of the American-owned María Isabel Sheraton Hotel of Mexico City expelled a group of Cuban officials upon pressure from the United S tates government and confiscated their funds. The Cuban officials were meeting U.S. energy executives from organizations that included Valero, the United States' biggest oil refiner, the Louisiana Department of Economic Development, and the Texas port of Corpus Christi.
Voices of opposition were soon heard from the government of Mexico, the Government of Cuba, and most candidates in the 2006 presidential election. The Chamber of Deputies publicly condemned the violation of Mexican law and the rights of a group of consumers who were subjected to discrimination. On February 7, the United States Department of State declared on this matter that American law imposed upon American companies is applied regardless of the location of the company.
http://en.wikipedia.org/wiki/Law_of_Protection_of_Commerce_and_Investments_from_Foreign_Policies_that_Contravene_International_LawTruly this is a vicious, internationally illegal form of economic war on Cuba which has been in effect in some form for 50 years at least, and protested world-wide. It was meant to bring so much hardship to the population it would overthrow the revolutionary government, and do to the country what would otherwise be accomplished by an invasion by the U.S. which itself would be abhorrent to the rest of the world, and protested widely.