If you had to fill up your vehicle with gas over the weekend, you probably noticed this right away.

Prices at the pump have jumped 11% over the past week, the highest since July 2008, as global sanctions have hit Russia’s ability to export crude oil after its invasion of Ukraine.

AAA said the average for a gallon of gas in the U.S. topped $4.00 on Sunday, up from $3.60 a week ago — and up 45% from $2.76 a year ago.

The most expensive gas in the country is in California at $5.28 a gallon, followed by Hawaii ($4.69), Nevada ($4.52), and Oregon ($4.46), according to AAA.