840 Million, not Billion, is what the headline says.
The cost of $1 Trillion has been cited in other sources.
The cost of $40-$60 billion a month has been cited as what the Uke govt needs to sustain itself ( aside from weapons)
Current debt to GDP is 80% and will be 100% by January.
Ukraine derives 2/3 of its GDP by loans and donations.
Basically, Ukraine is the guy on the street with a sign begging for money.