US STOCKS-Futures point to flat open, major indexes at records
* Investors watching situations in Greece, Ukraine
* S&P 500 coming off record closing high
* Celsus shares plummet after drug fails study
* Dow down 24 pts, S&P down 4.25 pts, Nasdaq up 2.25 pts (Updates prices)
By Ryan Vlastelica
NEW YORK, Feb 17 (Reuters) - U.S. stock index futures pointed to a quiet open on Tuesday, the first trading session after the S&P 500 closed at a record high, although investors continued to watch the uncertainty over a Greek debt deal and a fragile Ukraine truce.
Equities have been in an uptrend lately, with major indexes notching a second week of solid gains last week. Much of the advance came on signs of progress for the debt deal in Greece, as well as reduced tension between Russia and Ukraine.
Both situations appeared less stable over the long weekend when U.S. stock markets were closed Monday for the Presidents Day holiday. European Union finance ministers pressured Greece to remain in an international financial rescue program after talks collapsed on Monday. U.S.-listed shares of the National Bank of Greece fell 11 percent to $1.44 in heavy premarket trading.
In eastern Ukraine, Pro-Russian separatists said they would not carry out an agreement to pull back heavy guns, putting a shaky peace deal at risk. Continuación...