[17][16] On 19 February 2021, the National Security and Defense Council of Ukraine included Medvedchuk and his wife, Oksana Marchenko, on the Ukrainian sanctions list, due to alleged financing of terrorism.

[18] On 11 May 2021, the Prosecutor General of Ukraine accused Medvedchuk of treason and attempted looting of national resources in Crimea (which had been annexed by Russia but remains internationally recognised as Ukrainian).

[26] Volodymyr Medvedchuk was arrested by SMERSH on 7 August 1954 and sentenced to eight years of imprisonment and four of exile in Siberia "for participation in Ukrainian nationalistic activities.

"[34][31] According to Ukrainian lawyers Roman Titikalo and Ilya Kotin, Medvedchuk seems to have recognized the guilt of his client Stus during the court case.

[57] A December 2013 poll by the Sociological group "RATING" gave it 0.7% and predicted that Medvedchuk's result in the first round ballot of the next (Ukrainian) presidential election would be 0.9%.

[citation needed] Euromaidan activists alleged that Medvedchuk was among the masterminds of the attempted murder of Ukrainian journalist Tetiana Chornovol on 25 December 2013.

[64] The next day, the Ukrayinska Pravda newspaper published an investigative article on Medvedchuk's allegedly illegal takeover of a government property back in 2004, while Head of Administration for the Ukrainian President.

The source of the information was named as Mykhailo Chechetov (the state property chief at the time), who had been "forced" (in his own words) to help Medvedchuk in that deal.

[69] In an August 2016 interview with Radio Svoboda, Medvedchuk stated that from a legal point of view, Crimea is part of Ukraine, "but de facto, unfortunately, it belongs to Russia.

"[70] Medvedchuk was present at negotiations with the armed separatist in the Donetsk and Luhansk provinces on 21 June 2014 to discuss President Petro Poroshenko's peace plan although it was unclear whom he represented there.

[76] About the negotiations, Medvedchuk wrote on his Facebook page on 28 June 2014, "Hope that a compromise will be found has appeared and we'll manage to find a way of the present situation, retaining the territorial integrity of Ukraine and restoring peace".

[80][81][82] In June 2021 Petro Poroshenko claimed that Medvedchuk had been involved in the prisoner exchange negotiations on the insistence of Russian President Vladimir Putin.

[83] In an August 2016 interview with Radio Free Europe, Medvedchuk urged the Ukrainian authorities to "reach a consensus" directly with the militant leadership ("DPR" and "LPR"), because, according to him, "there is no other way to return these territories".

[31][32] On 19 February 2021, the National Security and Defense Council of Ukraine included Medvedchuk and his wife, Oksana Marchenko, on the Ukrainian sanctions list, due to the financing of terrorism.

[87] On 11 May 2021, Medvedchuk and fellow Opposition Platform — For Life lawmaker Taras Kozak were named as suspects for alleged high treason and the illegal exploitation of natural resources in Ukraine's Russian-annexed Crimea.

[68] On 19 February 2021, the National Security and Defense Council of Ukraine included Medvedchuk and his wife, Oksana Marchenko, on the Ukrainian sanctions list, due to alleged financing of terrorism.

[18] In January 2022, Medvedchuk was placed under sanctions by the United States, accusing him of involvement in a plot to set up a collaborator government in the wake of a Russian invasion.

[97] On 13 February 2025, Ukrainian President Volodymyr Zelenskyy imposed sanctions on multiple oligarchs and individuals including Medvedchuk on suspicion of “high treason” and assisting a terrorist organization, particularly their role in compromising national security through unfavorable business agreements with Russia.

[99] During a massive build-up of Russian troops around Ukraine's borders in the first weeks of 2022, Medvedchuk was one of two people (the other one being Oleg Tsaryov) identified by the United States intelligence community as a possible Kremlin-supported choice to lead a pro-Russia puppet Ukrainian government.

[100][a] On the opening day of the invasion, 24 February 2022, some analysts expected that Putin may have wanted to install Medvedchuk as president of Ukraine if Russian forces captured Kyiv.

[22] Although Medvedchuk's whereabouts were still unknown on 18 March 2022, on that date an investigating judge granted the prosecutor's request to impose an in absentia precautionary measure.

[108][109][d] On 12 April 2022, the Security Service of Ukraine (SBU) arrested Medvedchuk in "a lightning-fast and dangerous multi-level special operation",[23] claiming they had foiled an attempt by Russia to get him out of the country.

[23] Zelenskyy suggested exchanging Medvedchuk for Ukrainian prisoners of war held by Russia, but on 13 April Russian officials refused this offer.

[112] On 18 April 2022 Medvedchuk released an appeal to the Presidents of Russia and Ukraine to be exchanged for Ukrainian troops and civilians who were trapped in the Siege of Mariupol.

"[114] On 21 September 2022, as part of a prisoner swap, Ukraine handed over Medvedchuk and 55 Russian prisoners of war to Russia per the Security Service of Ukraine;[9] Russia in turn handed over 215[6] POWs, including 188 members from the Azov Regiment (including survivors of the Siege of Azovstal), members of the 36th Marine Brigade, National Policemen, Border Guards and an agent of the Security Service.

[6][115] Also freed were foreign volunteers serving in the Ukrainian Armed Forces Aiden Aslin, Shaun Pinner, Brahim Saadoun — who were condemned to death by a tribunal set by the Donetsk People's Republic.

[125] In March 2024, the Czech Republic accused Medvedchuk of financing a pro-Russia propaganda network under the media outlet Voice of Europe that paid European politicians in cash or cryptocurrency in an attempt to influence elections.

[4] In the 2019 Ukrainian parliamentary election, Medvedchuk's brother Serhiy lost as an Opposition Platform — For Life candidate in single-seat constituency 105 (Luhansk Oblast).

[96] In July 2022, Medvedchuk's Bell 427 helicopter and a Gulfstream G650 business jet was seized and handed over to the Ukrainian Army, as part of the ongoing investigation on him for abuse of power and embezzlement.

[14] In his 2015 book All the Kremlin's Men, Russian journalist Mikhail Zygar claimed that Putin believed that no question involving Ukraine could be solved without Medvedchuk.