Euro rises vs dollar ahead of ECB; yen tumbles broadly

While the euro gained ground, it remained vulnerable to profit taking, especially with its recent sharp and swift move higher drawing the attention of policymakers.

French President Francois Hollande called on the euro zone on Tuesday to protect the currency from "irrational movements", but German Economy Minister Philipp Roesler said countries must focus on boosting competitiveness and not on cutting the value of their currency.

The comments did not have an immediate impact on the euro, but served as an indication of the growing split among leaders on the euro's strength, and this could check its further gains.

Nevertheless, investors bought the euro as upbeat economic data affirmed that the worst of the region's debt crisis is likely over.

The euro zone's battered economy is probably recovering but the gulf between its two biggest members is widening, according to a survey on Tuesday that showed business optimism in the bloc at an eight-month high.

Euro zone data showed the services sector had improved more than expected in January.

The euro earlier hit a low as political uncertainty weighed on the currency. In Spain, the prime minister is facing calls to resign and Italy holds a general election later this month.

"While investors are inclined to take profits on the euro ahead of the ECB meeting, any weakness will likely become a buying opportunity," said Omer Esiner, chief market analyst at Commonwealth Foreign Exchange in Washington D.C.

"Should Draghi hold a relatively upbeat news conference on Thursday that echoes the one he held last month it will be a green light for the euro to return to recent highs," he said.

The euro last traded at $1.3524, up 0.1 percent on the day, but was still well below a near 15-month high of $1.3711 struck on Friday. Chart support was seen at $1.3414, a low hit on January 29.

The ECB is unlikely to contemplate an interest rate cut at Thursday's policy meeting despite the euro's sharp rise, but its chief almost certainly faces a grilling afterwards over an Italian banking scandal.

The euro's strength will need to show significant harm to the economy before the Governing Council reverses course, and there is next-to-no chance of that happening at its monthly meeting.