Moody's hit embattled German automaker Volkswagen with a credit downgrade, saying the company's reputation and earnings were at risk from the growing emissions cheating scandal.
Moody's cut France's sovereign debt rating one notch to Aa2, saying the country will struggle with slow growth and a high debt burden for the next five years.
Moody's cut Russia's debt rating by one notch into 'junk' territory, saying the Ukraine crisis and the fall in oil prices and the ruble will further undermine Russia's economy.
Low oil prices normally help grease the wheels of business and spur global economic growth, but Moody's said it would not revise its forecasts for the G20,.
According to the rating agency, GDP can be maintained at 5% in 2014, with the growth depending on the giant Kashagan oilfield expected to start commercial production later this year.
Moody's stripped Britain of its triple-A debt rating Friday, saying government debt was still mounting and that growth was too weak to reverse the trend before 2016.
France came under fresh economic pressure as the international ratings agency Moody's cut the French government bond rating by one notch from the highest level to "Aa1".
Rating agency Moody's warned Monday that Italy's banks face worsening conditions over the coming year with asset quality declining, low profitability, and poor access to markets for funds.
Moody's on Monday lowered the European Union's long-term issuer rating outlook from stable to negative, saying the move reflected credit risks of the bloc's key budget contributors.
Moody's said Thursday that it would hold its review of Spain's credit rating until late September as it waits for more clarity on the European Stability Mechanism and moves for a eurozone banking union.
Ratings agency Moody's Investors Service Monday upgraded South Korea's sovereign credit rating, citing strong fiscal fundamentals and resilience to external economic shocks.
Moody's took the first step toward stripping Germany of its coveted AAA credit rating on Monday, cutting the outlook for Europe's largest and most pivotal economy to "negative."
The euro was under fresh selling pressure to fall below $1.22 in Asia trade on Friday after ratings agency Moody's on Friday downgraded Italy's government bond rating.