The so-called general license means U.S. sanctions will not apply for 30 days on deliveries of Russian oil that has been loaded on tankers as of Friday.
The International Energy Agency (IEA) says it is the 'largest supply disruption in history'. With the disruption expected to have a lasting impact on prices, governments around the world have introduced measures to limit the impact on consumers and the economy.
"As we have made clear, we will pursue global maritime enforcement efforts to disrupt illicit networks and interdict sanctioned vessels providing material support to Iran - anywhere they operate. International waters are not a refuge for sanctioned vessels."
The country is at risk of 'stagflation' - where slow economic growth is combined with rising inflation - as the energy crunch brought about by the war in the Middle East hits.
After the country's 10 million people had been plunged into darkness overnight, the Caribbean island's national power grid had fully come back online by 6:11pm (22:11 GMT) on Tuesday. However, officials said power shortages may continue because not enough electricity is being generated.
These talks have been aimed at seeking solutions, through dialogue, to the bilateral differences between our two nations. There are international factors that have facilitated these exchanges. During our discussions, the Cuban side has expressed its willingness to carry out this process on the basis of equality and respect for the political systems of both states, for sovereignty, and for the self-determination of our governments.
For decades, Cuba's tourism sector has enjoyed a reputation as an "economic locomotive" a term used by authorities who saw it as the lifeblood of the Caribbean island country's economy. But the industry has been in decline since its 2018 peak, and the U.S. government's squeeze on Cuba's oil supply has pushed the nation's most crucial industry closer to its breaking point.