Quote Originally Posted by George1992 View Post
Does "заявил о" mean "announced"?
Yes.

Quote Originally Posted by George1992 View Post
Does "выплата" mean "redeem/pay off" (verb) or "payment" (noun)?
Выплатить долг — To pay off a debt.
Выплата долга — Pay off of a debt.

Quote Originally Posted by George1992 View Post
And finally, does "$2,5 млрд долга" mean "$2,5 миллиардного долга" or "$2,5 миллиард долга"?
«двух с половиной миллиардов долларов долга».

The phrase does not imply that $2.5M is the whole debt. It can be only a part of the debt. We don’t know this from the phrase itself.