U.S. President Barack Obama has warned of consequences should Assad use the weapons.

UN weapons inspectors said they want Iraq warned of consequences if it obstructs their work.

Authorities in Britain have seized data from Cambridge Analytica in their investigation, and EU officials have warned of consequences for Facebook.

Analysts, the central bank and the International Monetary Fund have warned of consequences if the country does not rein in its budget.

The Russian embassy hit back saying it dubbed the move "as totally unacceptable, unjustified and shortsighted" and warned of consequences.

Echoing Juncker, Germany's Schulz also warned of consequences if EU government leaders ignored the voters and picked a candidate not on the ballots.

Finance ministers are to hold crisis talks amid the global market turmoil as EU commissioner Ollie Rehn warned of consequences over the European debt crisis.