KIEV, June 11 - President Viktor Yushchenko on Thursday criticized Prime Minister Yulia Tymoshenko for the natural gas agreement she negotiated with Russia in January for causing serious financial trouble for Naftogaz Ukrayiny.

Yushchneko, who spoke at a special meeting aimed at rescuing Naftogaz Ukrayiny from bankruptcy, said the agreement must be reviewed along with quick measures to financially improve Naftogaz.