US STOCKS-Wall St climbs on Ukraine deal, Swedish stimulus
* Ceasefire deal reached between Ukraine, Russia
* Sweden introduces negative interest rates, bond buys
* Cisco up after results; Tesla falls
* Expedia to buy Orbitz; shares jump
* Indexes up: Dow 0.24 pct, S&P 0.55 pct, Nasdaq 0.68 pct (Updates to late morning)
By Chuck Mikolajczak
NEW YORK, Feb 12 (Reuters) - U.S. stocks climbed on Thursday and the Nasdaq touched a 15-year high following a ceasefire agreement between Russia and Ukraine and surprising stimulus measures by Sweden's central bank, although soft economic data tempered gains.
Leaders of Germany, France, Russia and Ukraine agreed a deal to end fighting in eastern Ukraine, potentially removing a concern for investors, although the pact remained fragile.
Talks over Greek debt with euro zone finance ministers failed to yield an agreement on Wednesday, although negotiations were set to continue next week. Greek Prime Minister Alexis Tsipras was in Brussels to state his case for more financial help to fellow EU leaders after the talks with finance ministers stalled. Continuación...