US STOCKS-Futures flat, with major indexes at records
* Investors watching situations in Greece, Ukraine
* S&P 500 coming off record closing high
* Crude oil rises for third straight session
* Dow down 7 pts, S&P down 2.5 pts, Nasdaq up 5.25 pts
By Ryan Vlastelica
NEW YORK, Feb 17 (Reuters) - U.S. stock index futures were unchanged on Tuesday, the first trading session after the S&P 500 closed at an all-time record, although investors continued to watch uncertain situations overseas.
* Equities have been in an uptrend lately, with major indexes notching a second straight week of solid gains last week. Much of that advance came on signs of progress for a debt deal in Greece, as well as reduced tension between Russia and Ukraine.
* While both situations appeared less stable over the long weekend, when the U.S. stock market was closed for Presidents Day, investors were not spurred to sell, supported as crude oil rose for the third straight day.
* In Europe, European Union finance ministers piled pressure on 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 15 percent to $1.37 in heavy premarket trading. Continuación...