"To date, neither Russia nor the forces it is supporting have come close to complying with their commitments," Kerry said in a prepared statement to lawmakers on the second day of intense congressional hearings.
And he renewed warnings that "if failure continues, there will be further consequences -- consequences that would place added strains on Russia's weakened economy."
In recent days, the US administration has lashed out at Russian President Vladimir Putin and his ministers, accusing them of openly lying to the international community.
"No. In all seriousness, no. One cannot accept Vladimir Putin at his word because his actions have belied his words repeatedly, particularly in the context of Ukraine," Rice told PBS television.
Highlighting the biting sanctions which have already had a damaging effect on the Russian economy, Rice said that "how much he cares is a bigger question. I think he has to care."
"Will that, in the short term, cause him to -- to take the steps that we think are critical for him to take? That's a question to be answered. But this will come at a mounting and painful cost to the Russian economy and to Russian interests, particularly if he continues down this path."
But there was still no confirmation, from the Organization for Security and Cooperation in Europe (OSCE), of a pull-back of heavy weapons from the front line, the other key plank of the truce.
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