It was not just a technical thing... it was unilateral change of a legal contract and blackmail by Russian regime that yet again demonstrated clearly that contracts and treaties mean nothing to it.
Even freezing of central bank accounts is basically the unilateral unlawful change of contract.
Finland broke the contract with russian railroads, with russian electric providers, it cancelled the contract with RosAtom.
Additionally it started the process of joining NATO, which effectively breaks the peace treaty of 1948.