Russia and hosts The Netherlands won two gold medals each on the opening day of the International Skating Union European Speed Skating Championships in Heerenveen.
Thomas Krol and Ireen Wüst won the respective men's and women's 1,500 metres events for the home nation before Russia triumphed in both the men's and women's team sprints at Thialf ice arena.
Krol took victory in the men's 1,500m event in 1min 43.67sec, with defending champion Denis Yuskov of Russia the runner-up in 1:44.80 and fellow Dutchman Patrick Roest the third-place finisher in 1:44.82.
It came after Wüst had won the women's 1,500m event in 1:54.88.
Russia's Evgeniia Lalenkova was the silver medallist in 1:55.22, with compatriot Yekaterina Shikhova claiming bronze in 1:55.31.
Despite missing out on top honours in the individual events, Russia made no mistake in the team sprints.
In the women's event, Shikhova, Olga Fatkulina, Angelina Golikova and Daria Kachanova registered a surprise win over The Netherlands' Wüst, Letitia de Jong, Jutta Leerdam and Femke Kok, clocking a time of 1:26.17 to beat their rivals by 0.44 seconds.
Rounding off the podium were Poland's Natalia Czerwonka, Kaja Ziomek, Karolina Bosiek and Andżelika Wójcik, who finished 2.07 seconds back.
Russia's Pavel Kulizhnikov, Ruslan Murashov, Viktor Mushtakov and Artem Arefyev combined to win the men's event in 1:18.92.
Norway's Håvard Lorentzen, Henrik Rukke, Bjørn Magnussen and Odin Farstad ranked second in 1:20.18 and the top three was completed by Switzerland's Livio Wenger, Christian Oberbichler and Oliver Grob in 1:21.44.