By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- European stock markets moved markedly higher on Thursday after the European Central Bank cut interest rates and took the deposit rate into negative territory for the first time in euro-zone history.

The Stoxx Europe 600 index climbed 0.6% to 343.65, after trading close to the flat line earlier in the day.

The jump came after the ECB cut its key lending rate to 0.15% from 0.25% and cut the deposit rate to -0.1% from 0%, effectively charging banks to leave excess reserves parked at the ECB. The move was widely expected by economists as ECB members in recent weeks have hinted that monetary easing would be on its way.

Attention now turns ECB President Mario Draghi's news conference at 1:30 p.m. London time, or 8:30 a.m. Eastern Time. The central bank said in the rate release that Draghi will comment on the rate cuts at the conference and that further monetary policy measures will be released at 2:30 p.m. London time. Read: How to invest if the ECB cuts rates below 0%

The euro (EURUSD) slumped after the rate cuts, trading at $1.3569, down from $1.3606 ahead of the news.

The strong euro (EURUSD) has been cited as one of the reasons euro-zone inflation is stuck around a four-year low and the shared currency has been steadily declining from almost $1.40 since Draghi hinted at upcoming stimulus measures at the ECB's May policy meeting.

Index moves

Europe's equity benchmarks moved higher in the afternoon after trading in tight ranges leading up to the ECB call. Germany's DAX 30 index gained 0.4% to 9,961.82, while France's CAC 40 index rose 0.7% to 4,534.37. The U.K.'s FTSE 100 index gained 0.1% to 6,825.66.

The London market already started to move into positive territory midday after the Bank of England kept its key lending rate at a record low of 0.5% and made no changes to its 375-billion-pound ($628 billion) asset-purchase program.

The decision was widely expected as the central bank has signaled a rate hike won't be in the cards until 2015. However, after a string of solid economic data, some analysts have started to speculate that its first monetary tightening could come as early as the fall of 2014.

Among movers in Europe, shares of Volvo AB lost 2% after UBS cut the truck maker to sell from neutral.

Shares of BHP Billiton PLC (BHP) dropped 0.1% after RBC Capital Markets shifted its preference within the mining space from BHP to Rio Tinto PLC (RIO).

In data releases on Thursday, Eurostat said euro-zone retail sales in volume terms rose 0.4% in April, compared with March. Year-on-year, retail sales improved 2.4%, marking the strongest annual growth rate in seven years.

Meanwhile, the Ukraine-Russia standoff remained in the spotlight, as Western leaders gathered in Brussels for the second day of the Group of 7 (G7) summit that kicked off on Wednesday. U.S. President Barack Obama and European leaders warned the Kremlin they will introduce tougher economic sanctions if Russia doesn't stop the violence in eastern Ukraine.

More must-reads from MarketWatch:

Could the euro face a short squeeze after the ECB?

A stock-market prediction that's 'kind of scary'

U.K.'s economy is still vulnerable: BOE official

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