According to Reuters who are posting that a member of Putin’s human rights advisory council has told them she considers Russia’s actions in Ukraine are an invasion

Official line or not ? No further detail at present

Add:

Ella Polyakova says:

When masses of people, under commanders’ orders, on tanks, APCs and with the use of heavy weapons are on the territory of another country I consider this an invasion

Elsewhere Finland’s defence ministry says suspect Russian aircraft has violated Finnish air space. Third time in a week