The president publicly backed Crown Prince Mohammed bin Salman in the aftermath of the killing despite evidence of his involvement.
President Donald Trump has said a force of Americans will remain in the east of the country to guard the oil fields there.
The U.S. is set to deploy some 600 soldiers to guard eastern Syria's oil fields against Islamic State remnants, though Trump has said he wants to bring in a U.S. company to develop the resources.
Foreign ministry spokesperson Maria Zakharova said the international community had the right to question the U.S. policy.
The dictator suggested Trump's transactional foreign policy is illustrative of America's global approach.
"We have taken it and secured it," Trump said on Sunday in regards to Syria's oil.
Trump said this weekend he would like to get U.S. companies into eastern Syria to "properly" exploit the oil fields there.
Defense Ministry spokesman Igor Konashenkov claimed U.S. troops protected American oil smugglers who circumvented sanctions in return for petrodollars.
Vast oil and gas deposits are believed to be buried under the Arctic, where climate change is melting sea ice and uncovering new commercial opportunities.
While the young activist was a favorite, the 2019 award went to Abiy Ahmed, the Prime Minister of Ethiopia.
Iran's upcoming "Hormuz Peace Endeavor" would include an invitation for potential cooperation with Saudi Arabia as a gesture to work together in the world's most important maritime oil chokepoint.
Iranian parliament speaker Ali Larijani also labeled an American-led coalition currently stationed to protect commercial interests in the area "a new means for plundering the region."
The White House has been considering how to respond to the weekend's attacks on Saudi oil infrastructure, which both Washington and Riyadh are blaming on Iran.
Retired Admiral William McRaven said the president's team must draw on their expertise to provide Trump with a range of options to respond to the attacks on Saudi Arabia.
"These contradictory remarks are either a sign of their confused policies or is a trick to confuse the other side," Ali Khamenei said Tuesday.
After the attack on Saudi oil facilities on Saturday, it is likely U.S. consumers will see a 10 to 25 cent increase per gallon for gas as early as Tuesday.
"There's a vacuum of leadership inside the White House," the former White House communications director said.
"This is nonetheless a historically large disruption on critical oil infrastructure and these events represent a sharp escalation in threats to global supply with risks of further attacks," the bank wrote.
The weekend strike on the Saudi Abqaiq facility appears to have dashed any hopes of a detente between Washington and Tehran.
Yemen's Iran-backed Houthi rebels claimed responsibility for drone attacks at the world's largest oil processing facility in Saudi Arabia, military and government spokespersons said Saturday.
A shale oil boom in the U.S. is helping to create a glut in supply, putting pressure on OPEC to cut production.
"This may be something people may want to consider in the decisions they are making," Lisa McKenzie, senior author of the study, said.
Foreign Minister Javad Zarif gave an interview in New York City, where he is under tight visa restrictions, during a visit to the United Nations.
"Uncertainties remain, the challenge gets harder, but the future's bright, now we've a charter," the OPEC+ poem read.
The president's national security adviser also suggested Iran is still seeking a nuclear arsenal despite its adherence to the 2015 nuclear deal.
Previous reports suggested the main responsibilities of about 1,500 additional U.S. troops would be "defensive in nature."
Iran's top diplomat said his country was not interested in escalation, but Iranians "will defend ourselves" and such an escalation would mean "painful consequences" for both sides.
Iranian Foreign Minister Mohammad Javad Zarif challenged President Donald Trump to "drain the swamp" of Washington war hawks like John Bolton.
"I'm not a military man, but what I can tell you is that we do not fire missiles out of small boats," said Iran's U.N. ambassador Majid Takht Ravanchi.