"Two days ago, we paid USD 39 million (34 million euros) for (Western-held) Eurobonds, and we will also pay USD 75 million to cover the so-called Russian bonds," Natalie Jaresko told reporters.
Russia had warned it would ask the International Court of Justice in The Hague to declare Ukraine in default if it failed to make a scheduled USD 75-million interest payment on Saturday.
Jaresko said the money would be delivered on Monday because Saturday was a bank holiday.
The pro-Western leadership that emerged after three months of protests over that decision has denounced the loan as little more than a Kremlin bribe and recently tried to delay its repayment.
But Moscow -- already accused by Kiev and the West of orchestrating and supporting the pro-Russian uprising in Ukraine's separatist east -- has refused to negotiate and still expects the bond's principal returned when it matures in December.
The potential savings form a part of a USD 40-billion global rescue package that also includes IMF lending and is meant to keep the strategic former Soviet country from going bankrupt and into default.
Jaresko said tough rounds of separate negotiations with Ukraine's private Western lenders will continue next week.
But she stressed that Ukraine still expected those creditors -- comprised of four US financial titans who include the likes of Franklin Templeton -- to take a so-called "haircut" that will see the principal's value slashed and the coupons' payments reduced and delayed.
The group of four holds about two-thirds of the debt Ukraine is trying to delay repaying and has firmly rejected the proposed deal.