Protesters were out on the streets of cities such as Rome and Lisbon to denounce the Russian invasion which the UN estimates has killed or wounded more than 35,000 civilians since February 2022, Euronews reports.
Protesters in Rome have gathered in support of Ukraine as the 1,000th day since the Russian invasion in February 2022 approaches.
People from Italy's Ukrainian community were joined by Italians and other foreign nationals living in the country to stage a rally just a few hundred metres from the Russian embassy in Rome.
Many protesters wore Ukrainian flags and held banners and placards calling for a stop to the invasion.
They also held a religious ceremony and observed a moment of silence for fallen Ukrainian soldiers.
"There must be a just peace. We cannot forgive all that Putin has done during all these years, not just from 2014 but also before. He never let us live in peace, so we cannot and we will not forgive, we cannot surrender, for the sake of our future," said Maria Meleshko, a Ukrainian living in Italy.
There were similar scenes in Portugal with dual pro-Ukraine rallies in the capital Lisbon and in the city of Porto.
Demonstrators held Ukrainian and European Union flags and demanded an immediate ceasefire in the country.
"We know that the United States can help Ukraine in a strong way so that Ukraine can remove Russian troops from its territory," said Pavlo Sadokha, the president of the Association of Ukrainians in Portugal.
Meanwhile in the Finnish capital Helsinki, it was Russian nationals on the street protesting against the war in Ukraine.
Around a hundred protesters urged the governments of Finland and other European countries to continue supporting Ukraine, regardless of any potential change to US policy under incoming US President Donald Trump.
Protesters chanted 'Victory for Ukraine, peace to Europe, Putin to prison!' as they marched to the Russian Embassy where they demanded the immediate withdrawal of Russian troops from Ukraine and the release of political prisoners.
"I am here to show the Finnish and also the European society that there are many Russians who do not support the [Putin] regime and who do not support this terrible war and also to show the people of Russia that they are not alone," said Russian national, Daria Drobysheva.