G20 finance chiefs sharpened their stance against governments trying to influence exchange rates as they sought to tame speculation of a global currency war without singling out Japan for criticism.

Two days of talks between G20 finance ministers and central bankers ended in Moscow on Feb 16 with a pledge not to "target our exchange rates for competitive purposes", according to a statement. That's stronger than their position three months ago and leaves Japanese officials under pressure to stop publicly giving guidance on their currency's value.

With the yen near its lowest level against the dollar since 2010, policy makers are attempting to soothe concern that some countries are trying to weaken exchange rates to spur growth through exports. The risk is a 1930s-style spiral of devaluations and protectionism if other countries retaliate to safeguard their own economies.