Emerging-market currencies have surrendered their gains for the year, undone by a resurgent dollar that climbed on mounting bets the Federal Reserve will keep interest rates higher for longer. The broad-based retreat erased months of appreciation across developing-nation exchange rates, leaving traders reassessing positions that had benefited from earlier dollar weakness.

The greenback's advance gained momentum as swaps markets priced in a shallower easing cycle, pushing Treasury yields higher and widening the rate differential that favors dollar-denominated assets. Carry trades that had flourished during the dollar's spring slump now face pressure, with emerging-market currencies retracing their advance since January.

Nations running current-account deficits and those with heavy dollar-denominated debt face the sharpest headwinds, as tighter global financial conditions raise refinancing costs and strain fiscal buffers. Several central banks have intervened or signaled readiness to defend their currencies, though policy ammunition remains limited compared with previous tightening cycles.

The reversal underscores how quickly sentiment shifts when US rate expectations move, turning what looked like a structural EM rally into a round-trip trade. With the Federal Reserve's next policy meeting still weeks away, volatility seems set to persist as markets parse every data print for clues on the cutting timeline.