German Defense Minister Boris Pistorius said Western countries will continue to provide Ukraine with weapons despite Russian threats.
Wagner founder Yevgeny Prigozhin made the challenge in a video published by his press service.
The research estimates that for every soldier killed, three or four are wounded in combat.
There are currently two private military groups deployed to the war in Ukraine.
Chechen Leader Ramzan Kadyrov said he has the personal intention of "fighting Satanism" throughout Europe, beginning with Poland.
President Joe Biden on Tuesday will deliver his second State of the Union address to likely his largest audience of the year.
Ukraine is set to send rescuers to Turkey after a 7.8 magnitude earthquake struck Turkey and Syria on Monday.
A Russian web magazine last month interviewed former Wagner fighters who said the group follows an "attack or be shot" discipline.
Top Ukrainian official Oleksii Danilov claimed Brazil is one of the countries Russia is looking to act as an intermediary between Kyiv and Moscow.
Ukrainian Utah State basketball player Max Shulga noted that "emotions can run high" during the game, and people can say things they do not really mean.
Ukrainian civilians in the city of Tokmak are being asked to move out onto the streets in order to accommodate local collaborators.
Ukraine says Russia's military death toll in the war has reached over 131,200.
Ukraine also reported additional losses in Russian military equipment during clashes over the weekend.
The secretive Ukrainian battalion recruits civilians or soldiers from other voluntary units.
Ex-Israeli Prime Minister Naftali Bennett said Russia's President Vladimir Putin made the promise during a meeting in the early days of the invasion of Ukraine.
Ukrainian President Volodymyr Zelensky warned their Western allies that Russia is "preparing to take revenge" with a new major offensive.
The 38-year-old Russian woman was charged with displaying "Nazi symbolism or symbols of extremist organizations."
Pentagon refused to comment on the matter, but it noted Ukraine's "remarkable performance" in retaking its territories from the Russian forces.
The Wagner Group is believed to be commanding at least 50,000 fighters in the war in Ukraine.
One of the homes raided belonged to Oksana Datiy, the acting head of Kyiv's tax authority.
Russian Prosecutor General Igor Krasnov has claimed that at least 9,000 soldiers illegally mobilized by the state have been sent home.
Adult content subscription platform OnlyFans got banned in Russia, likely by its owners.