French President Emmanuel Macron has promised to help with mediation in the political crisis in Belarus, but Russian Vladimir Putin lashed out at "unprecedented external pressure".
Mr Macron spoke during a visit to Lithuania after a meeting with Belarusian opposition leader Svetlana Tikhanovskaya that was seen as a major show of support for the activist.
"We will do our best as Europeans to help mediate and we will come back to OSCE mediation in order to progress," Mr Macron told reporters, referring to an offer from the Organisation for Security and Cooperation in Europe (OSCE).
"Our objective is for this mediation to begin in the next few days or weeks," he said, adding that German Chancellor Angela Merkel and EU chief Charles Michel would "push" Belarus to accept mediation.
Sviatlana Tsikhanouskaya, former candidate for the Belarus' presidential elections arrives for a meeting with French President Emmanuel Macron. Source: AAP
"The aim is a peaceful transition, the release of people who are in prison for their political opinions and the holding of free elections under international observation," he said.
Belarus has been in upheaval since a 9 August presidential election in which Ms Tikhanovskaya claimed victory against the incumbent Alexander Lukashenko, who has ruled Belarus since 1994.
Ms Tikhanovskaya fled to Lithuania in the aftermath of the vote as mass protests in the streets of the former Soviet republic were met with a crackdown in which thousands were arrested.
The European Union has refused to recognise the result of the election which gave Lukashenko 80 per cent of the vote, and Mr Macron on Sunday said that he "has to go".
EU leaders are preparing to adopt sanctions against Mr Lukashenko and other top Belarusian officials at a summit later this week.
Tuesday's meeting with Mr Macron in Vilnius was Ms Tikhanovskaya's most high-profile one so far.
She has previously addressed the UN Human Rights Council and the European Parliament and has met with EU foreign ministers and the leaders of neighbouring Poland and Lithuania.
Ms Tikhanovskaya, a political novice whose blogger husband is in prison in Belarus accused of trying to overthrow the government, said she had accepted an invitation to speak at the French parliament.
Parliamentary officials said she would address the lower house's foreign affairs committee.
Ms Tikhanovskaya said the crisis should be resolved "as soon as possible" and new free and fair elections should be held by the end of the year.
"[Macron] supports the idea of mediation because he understands that powerful countries need to be involved to begin negotiations with Lukashenko. He is ready to help with this," she said.
"I think he will speak with the Russian side about Belarus and will do everything possible to involve Russia in these negotiations."
Belarus' President Alexander Lukashenko takes oath of office during an inauguration ceremony at the Palace of Independence. Source: AAP
Mr Macron has said that Mr Putin, Mr Lukashenko's main ally, is favourable to mediation in the Belarus crisis by the OSCE.
But Mr Putin on Tuesday said in televised remarks that Belarus was in a "difficult situation" and was facing "unprecedented external pressure".
Addressing a forum on the Belarusian and Russian regions, the Kremlin chief said Moscow was ready to stand by Minsk, describing ties as "timeless and all-weather".
Mr Putin has promised to provide Mr Lukashenko with security assistance if the political crisis worsens and gave Belarus a loan of $1.5 billion.
