Oil markets have been trending higher in the past week and got another boost — albeit a muted one — Monday from the weekend events in Russia, but the benchmark retail diesel price declined for the 19th time in the past 21 weeks.

The Department of Energy/Energy Information Administration average U.S. retail diesel price used for most fuel surcharges declined 1.4 cents a gallon to $3.801. It meant that last week's increase of 2.1 cents a gallon, which ended a string of eight consecutive weeks of declines, proved short-lived.

Monday's latest decline came even as futures markets in oil have been increasing. From a recent low of $2.3091 a gallon on June 12, ultra low sulfur diesel (ULSD) on the CME commodity exchange climbed as high as $2.5642 Wednesday before sliding back to $2.4071 to close the week. 

Prices were higher Monday partly on the back of the weekend short-circuited coup in Russia, or whatever it's being called. However, the overall increase in ULSD of 3.17 cents a gallon to a settlement of  $2.4388, up 1.32%, could be considered tame given that the prospect of a change in government or at least some sort of upheaval in the world's third-largest oil producer might at other times be deemed enormously bullish for prices.

But a report from Reuters, quoting traders and the Refinitiv Eikon analytics firm, said there were no reports of supply interruptions.

ULSD on the CME did trade almost 3 cents a gallon more than the settlement earlier in the day, topping out at $2.4651. Diesel significantly outperformed the increase in Brent, the world's crude benchmark. That was up 45 cents a barrel to $74.18, but that marked a gain of just about 0.6%.