The country's national security and defence council took the decision to ban the parties from any political activity. Most of the parties affected were small, but one of them, the Opposition Platform for Life, has 44 seats in the 450-seat Ukrainian parliament.
The Opposition Platform for Life, Ukraine's biggest opposition party, is led by Viktor Medvedchuk, a pro-Moscow oligarch with close ties to the Russian president, Vladimir Putin.
The Ukrainian authorities last year charged Medvedchuk, a longtime ally of Putin who is believed to be the godfather of Medvedchuk's daughter, with treason and placed the oligarch under house arrest, a move that angered the Kremlin."
Of course, pro Russia media and pundits, including a bunch in the US, are reporting this as the "top" opposition party. The seats it now has were elected before the invasion.
Previous president, Petro Poroshenko, leads the European Solidarity Party.