Global economic growth is slowing more than was forecast a few months ago due to Russia's invasion of Ukraine, with energy and inflationary crises risking turning into recessions in major economies, the OECD said Monday.

While global growth this year was still expected at 3.0%, it is now forecast to slow to 2.2% in 2023, revised down from a forecast in June of 2.8%, the Organization for Economic Cooperation and Development said.

The Paris-based political forum was particularly pessimistic about prospects in Europe - the economy most directly exposed to the consequences of Russia's war in Ukraine.

Global output next year is now forecast to be $2.8 billion lower than the OECD forecasts before Russia attacks Ukraine - a worldwide loss of income equivalent in size to the French economy.

"The global economy has lost momentum in the wake of Russia's unprovoked, unjustifiable and illegal war of aggression against Ukraine. GDP growth has stalled in many economies and economic indicators point to a prolonged slowdown," OECD Secretary-General Mathias Cormann said in a statement quoted by Reuters.

The OECD projected that eurozone economic growth would slow from 3.1% this year to just 0.3% in 2023, implying that the currency bloc shared by 19 nations would spend at least part of the year in a recession, defined as two consecutive quarters of contraction.

This marked a dramatic drop from the OECD's latest economic outlook in June, when it had forecast that the eurozone economy would grow by 1.6% next year.