Maduro accused President Donald Trump of trampling on worldwide law and relations with Latin America by taking actions that he said would cause "great damage" to the Venezuelan oil economy as well as American investors who own the country's bonds.
Venezuelan military train civilians how to handle weapons.
On August 11, US President Donald Trump sent shockwaves through Venezuela's political establishment when he announced that "a military option is certainly something we could pursue" to end the South American nation's crisis.
Additional support for Venezuela was expressed by former Spanish Prime Minister Jose Luis Rodriguez Zapatero, former Dominican President Leonel Fernandez and former Panamanian President Martin Torrijos during a meeting with the former state dignitaries where the three condemned the financial and political pressure brought on by the US due to the sanctions and threats of military intervention.
This week, Trump signed a decree introducing financial sanctions against Venezuela.
If necessary the government would find new markets for the roughly 700,000 barrels of oil it sends daily to the USA, he said.
McMaster's remarks came after the announcement of a new round of U.S. economic sanctions on the South American country, restricting the Venezuelan government's access to American debt and equity markets.
"These measures are carefully calibrated to deny the Maduro dictatorship a critical source of financing to maintain its illegitimate rule, protect the United States financial system from complicity in Venezuela's corruption and in the impoverishment of the Venezuelan people, and allow for humanitarian assistance", the White House said in a statement.
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But the US delegation refrained from committing to a two-state solution - the primary focus of peace efforts for decades.
"The whole world is invited to the day of solidarity and support with Venezuela, for peace, for sovereignty", Maduro said during a preparatory meeting with representatives from social and political organizations from various countries.
Reflecting those concerns and a strong lobby effort by the US oil industry, Friday's action stopped short of cutting off USA imports of Venezuelan oil that are crucial both to both Venezuela's economy and to Gulf refiners.
Ever since Maduro announced there would be a Constituent National Assembly, countries from around the world - especially from the Americas - raised their voices to reject such actions as they consider them to be unconstitutional and awful for Venezuela's - already weak - democracy and division of power.
While Trump's administration is aiming to pressure Maduro, the new sanctions do not prohibit investors from buying the bonds that Goldman Sachs Asset Management purchased earlier this year.
Maduro spoke of the consequences of "four months of violence, of human damage, with more than 100 dead, more than 2000 injured", in which Venezuela has suffered "material damage. hospitals, schools, libraries, urban living centres were attacked".
Maduro pushed for a controversial vote to elect a "Constituent Assembly" with the power to rewrite the constitution as well as pass laws.
Especially since military threats were not even an option and had not been run by the U.S. Defense Department. Since the Constituent Assembly was put together, they have targeted the nation's outspoken prosecutor and other members of the opposition to be removed or jailed for speaking out against President Maduro. Venezuela risks a default on ballooning debt.
The measures ban trade in new bonds issued by the Venezuelan government or its cash-cow oil company, PDVSA.