KYIV, Feb 28 - At least 400,000 Ukrainian refugees have entered the EU so far, EU Home Affairs Commissioner Ylva Johansson said. EU members Poland, Romania, Slovakia and Hungary have land borders with Ukraine.

"We have to prepare for millions (to arrive in the EU)," Johansson told a news conference after a visit to a border crossing between Romania and Ukraine.

Johansson said she was hoping EU interior ministers would agree as early as Thursday on a protection scheme for those fleeing Ukraine.