Good morning.
I came across this old thread without determination by chance.
Algirdas, I agree with Guido, the spider is a female of Araneus diadematus, pregnant or full.
I'm not an expert either, but I've already met "crusaders" in Italy with this pale color and an incomplete abdominal pattern.
In any case, the 3 other Iceland species of Araneus (quadratus, sturmi, triguttatus) aren't similar with your spider.
A greeting.
Raf