US Secretary of State John Kerry on Wednesday warned Russia that sanctions pressure could be intensified over the Ukraine crisis but urged Kiev not to get drawn into "tit-for-tat" measures. Speaking to reporters in Paris after holding talks with French Foreign Minister Laurent Fabius, Kerry said "the choice is Russia's" as to whether to implement the Minsk agreement that was supposed to bring peace to Ukraine's restive east. "The president and I have repeatedy said that if the Minsk agreement is fully implemented, sanctions can be rolled back and if it isn't, pressure will only increase," said Kerry. Kerry said he had spoken to Ukrainian President Petro Poroshenko earlier and discussed the "need to continue to take the high road" in terms of sticking to the cease-fire. It was important "not to fall into the possibility invited by measures taken by Russia to engage in a tit-for-tat process," added the diplomat.