Crowdfunded local hero Virves had seen his overnight lead cut to just 5.3sec by Latvian Sesks, but worse was to follow when a puncture four stages from the finish cost 45sec and demoted him to third.
Sesks never put a foot wrong in his Ford Fiesta Rally4 throughout the three-day event. He was always inside the top three and victory takes him to the top of the championship with two rounds remaining.
Sami Pajari finished 14.7sec behind in second after difficulties early in the super-fast gravel road encounter. The Finn, who had 23.1sec in hand over Virves, won seven of the 17 stages and now sits second in the championship.
Briton Ruairi Bell claimed his best finish so far in fourth position after a consistent and faultless drive. He was more than 4min 30sec behind Pajari and comfortably clear of Italian Marco Pollara.
Fabrizio Zaldivar was on course for fifth but his hard work came undone in the penultimate stage when brake problems relegated him behind Pollara. He limped through the closing Wolf Power Stage to ensure valuable championship points.