In addition to writing the definitive work on the Holocaust in the Nikolayev region, Vladimir Shchukin also authored research papers on the Jewish presence in Ukraine more broadly.
The Jerusalem Post Podcast - Travel Edition, Episode 7 with Mark Gordon and David Harris
President Vlodymyr Zelensky, who is Jewish, condemned the embroidery marches, which had been conducted legally.
In 2016, the UN General Assembly designated April 26 as International Chernobyl Disaster Remembrance Day, recalling the long-term consequences of the disaster that continue to this day.
Earlier this month, Biden called on Putin to reduce tensions stirred by a Russian military build-up on Ukraine's border and proposed a summit to tackle a raft of disputes.
The former synagogue is in poor condition, requiring millions of dollars to be renovated.
Russia has temporarily restricted the movement of foreign warships and what it called "other state ships" near Crimea.
The reinforcement coincides with a huge build-up of Russian troops near Ukraine.
Ukraine's foreign ministry said Sosoniuk was held for several hours, but was now back at the country's consulate in St Petersburg.
Ankara has been strengthening ties with Moscow for years but said it would side with the West in Ukraine conflict.