Eriksen Soreide expressed hopes that talks on Friday between foreign ministers of the EU, of which Norway is not a member, would succeed in finding a common line in backing pro-democracy forces in Belarus.
"We were cautiously optimistic and hopeful some time ago that developments in Belarus would go in a more positive direction. And that optimism is now gone and that is also why we have to support those forces that want free and fair elections," she said.
"It is important for all Western countries and all democratic societies to support the quest for free and fair elections. That is something that every citizen in the world is entitled to and also why we support that demand in Belarus," Norway's top diplomat added.
Eriksen Soreide described the current uprising against the regime in Belarus as "a milestone" and said she was hopeful that the ongoing developments would lead to free and fair elections that could be monitored by international observers.
She also welcomed proposals from Latvia, Lithuania and Poland to help mediate in Belarus, but said that a transition to democracy presented big challenges. Among other things, she said, the lead-up to an election had also to be free and fair.
Opposition candidates in Belarus were often not approved by authorities or even jailed on charges that critics say were politically motivated, leading to a campaign that was increasingly one-sided as the elections approached.
The closest rival to Lukashenko in the elections, Sviatlana Tsikhanouskaya — who, according to the election commission, received under 10% of the vote compared with 80% for the president — has since fled to Lithuania, saying it was for the sake of her children.