The main measures were, briefly: targeted longer-term refinancing operations (also known as TLTROs) that provide financing to banks for up to four years, with the amount that an individual bank can borrow being linked to its loans and lending patterns to the private sector, at extremely favourable (in some cases, negative) interest rates; various asset purchase programmes, grouped under the umbrella acronym APP (expanded Asset Purchase Programme): an additional covered bond purchase programme (CBPP3); an asset-backed securities purchase programme (ABSPP); a corporate sector purchase programme (CSPP); and the large-scale public sector purchase programme (PSPP) as the main instrument to address weak inflation; the affirmation that full allotment in regular refinancing operations will continue at least until the end of 2017; and in terms of policy rates, a very low interest environment with the main refinancing rate, 2/4  BIS central bankers' speeches  which has stood at 0% since March 2016, and the negative deposit rate (negative since June 2014; currently –0.4%).
This drop is primarily due to the imposition of the capital controls and may therefore be reversed once the controls are fully removed.