From the article:
"Venezuela denounces before the world that a boat that holds 25 thousand tons of Soya, for food production in our country, has been seized in the Panama Canal, due to the criminal blockade imposed by Donald Trump," the vice president said in a tweet.
"Venezuela calls on the UN to stop this serious aggression by DonaldTrump's govt against our country, which constitutes a massive violation of the human rights of the entire Venezuelan people, by attempting to impede their right to food."
In a subsequent tweet, the Venezuelan senior official explained that the owner of the vessel carrying the merchandise of food was informed by the insurance company that it was prevented from moving that cargo to Venezuela.
The shipment seizure comes just days after Trump signed an executive order Monday that imposes a near-total blockade on government assets in that country, which includes an embargo against food suppliers, among other basic inputs. This is the first time in 30 years that Washington has taken such an action against a sovereign country.
An actual blockade would be a military (naval) action. The Venezuelan official called this a blockade, but it wasn't in the technical sense. The US isn't going to implement an actual blockade unless they actually invade the country.
What apparently happened here, is that the US sanctioned or threatened companies that insure tankers that would do business with and deliver goods to Venezuela. In other words, the US is using its financial might to achieve the same effect as a blockade withheld placing naval vessels at risk. Its just another bullying tactic in the attempt to bring about hardship to the population in the hopes that the citizenry will become discontent and rebellious and bring about regime change. To be effective policy, the US has to couple this with propaganda. Thus far, the propoganda has only worked on convincing the US citizenship that Maduro is the sole cause of shortages, but in Venezueala the US propaganda isn't working because the population has been educated enough to realize the US is pulling the strings.
Its apparent that with North Korea, Russia, China, Iran, and Venezuela, the US is using the military as a threat, but the real weapons are financial and propaganda. The US cannot afford to lose the support of its own citizens by actually committing the military to another war that results in US casualties. So instead, we get a long, drawn out conflict where attrition (who gets financially wiped out first) determines the outcome.