The head of Russia's investigative committee claims Moscow has charged 92 members of the Ukrainian armed forces with crimes against humanity.
Head of the committee, Alexander Bastrykin, informed the Russian government news site Rossiiskaya Gazeta that "more than 220 persons, including representatives of the high command of the Armed Forces of Ukraine, as well as commanders of military units that shelled the civilian population", had been accused.
Mr Bastrykin claimed that 92 commanders and their subordinates had been charged, and 96 people, including 51 armed forces commanders, are wanted.
The head of Russia's investigative committee proposed an international tribunal should be arranged with countries that have an "independent position on the Ukrainian issue", which would include Syria, Iran and Bolivia.
He told the Russian government news site that Ukrainians were involved in "crimes against the peace and security of humanity, which have no statute of limitations".
One thousand three hundred criminal investigations had been initiated into members of Ukraine's military, political leadership, radical nationalist associations, and armed formations, with more than 400 people so far held accountable, Mr Bastrykin said.
Targets of investigation included Ukrainian health ministry employees who he accused, without providing evidence, of developing weapons of mass destruction, as well as citizens of the UK, the US, Canada, the Netherlands and Georgia.
He told the newspaper that eight criminal cases had also been launched into attacks on Russian embassies or other representations in the Netherlands, Ireland, Lithuania, the Czech Republic, Poland, Romania and France.
Mr Bastrykin's claims have not been verified and Kyiv is yet to make a comment.
Ukraine is also conducting its own investigations. Earlier this month, reports said the country was examining more than 21,000 war crimes and crimes of aggression allegedly committed by Russian forces since the start of the invasion in February.
The Kremlin denies these allegations, or that it has been targeting civilians.