"I am convinced that, in light of the violent escalation of events, the EU has to reinforce the efforts in support of the political solution," Ashton said.
"The doors to dialogue and a political solution have to be kept open," she said in a statement announcing the trip.
EU Enlargement Commissioner Stefan Fuele will be in Kiev tomorrow while Ashton said a European Parliament delegation will also go there next week.
"It is imperative to avoid further worsening of the situation and to pave the way for a genuine dialogue between the authorities, the opposition and civil society," she said.
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"Member states want to privilege engagement and dialogue," the source said. "The overwhelming majority feel sanctions would be counter-productive."
In Berlin earlier, German Chancellor Angela Merkel said she currently saw no need to impose sanctions aganst Ukraine for the moment.
Yanukovych told European Commission head Jose Manuel Barroso in a phone conversation that he did not plan to introduce a state of emergency to curb the violent protests in Kiev.
In Kiev meanwhile, Yanukovych demanded an extraordinary session of parliament and was to hold talks with the three main opposition leaders after world boxing champion and UDAR (Punch) party leader Vitali Klitschko brokered a truce on the streets.