Russian President Vladimir Putin and Moscow's top diplomat Sergei Lavrov both blamed the West for creating global insecurity and instability.
The U.S. and its allies are seeking simultaneously to keep the OSCE alive and hold Russia to account for its invasion of Ukraine.
The European Union's foreign policy chief, Josep Borrell, said he understood unease about Lavrov attending the meeting in Skopje, North Macedonia.
But he said it was a chance for Lavrov to hear broad condemnation of Russia's war in Ukraine.
Estonia had been due to take over the annually rotating OSCE chairmanship but Russia blocked it for months.
Persons:
Vladimir Putin, Sergei Lavrov, Russia's Sergei Lavrov, Margus Tsahkna, Lavrov, Josep Borrell, Borrell, Dimitar Kovacevski, —
Organizations:
Organization for Security, Cooperation, Baltic, OSCE, Soviet, NATO, Tass, Russian, North Macedonia's, Kremlin
Locations:
Moscow's, Ukraine, U.S, Russia, Estonian, Brussels, Estonia, Lithuania, Latvia, Skopje, North Macedonia, Malta