Slovakia is helping Ukraine build gas supplies before the arrival of winter.
Fico informed that the reduction is gas supplies could be seen as a politically driven message for the EU, which has been negotiating the gas talks between Russia and Ukraine.
Fico was quoted as saying by the The Wall Street Journal: "What’s interesting in the case is that it isn’t about a lack of gas, but this is about playing with gas supplies as an instrument of political posturing."
The PM, however, added that a crisis meeting of the cabinet will be organised if the cutbacks continued.
Slovakia will continue to "fulfill its commitments" and supply Ukraine with the fuel, according to Fico, which is to be done through Eustream, the Slovakian gas pipeline operator.
Russian Gazprom had earlier reduced gas supplies to Slovakia, Austria and Poland, all of whom had been helping Ukraine with gas supplies.
Hungary, the other gas supplier for Ukraine, also stopped its shipments to Ukraine last week.