Today's action is focused on restricting the regime's access to American dept and equity markets. Maduro may no longer take advantage of the American financial system to facilitate the wholesale looting of the Venezuelan economy at the expense of the Venezuelan people. These measures will also undermine Maduro's ability to pay off political croonies and regime supporters and increase pressure on the regime to abandon it's disastrous path.
Under the executive order, US persons are prohibited from engaging in specified dealings involving the government of Venezuela. This includes state owned oil company, PDVSA. These prohibitions extend to transactions or activities occurring in the United States, and cover both debt and equity instruments. The executive order carves out short term financing for most commercial trade including the export and import of petroleum.
President Trump made it clear, the status quo is unacceptable. Today's actions is the next step towards freedom for the Venezuelan people.