The assets affected were in England, Wales, the Netherlands, and Luxembourg, Gazprom said, according to Reuters.

Read alsoUkraine receives Gazprom's payment for gas transit in full – Ukrainian GTS operator

Gazprom last month said it had paid Ukraine $2.9 billion to settle a legal dispute as part of a wider gas package deal.

In exchange, Ukraine was expected to sign a legal settlement and withdraw all outstanding claims.