To check this, the central bank has tripled interest rates and used hard currency reserves (now reduced to $10 billion in ready cash) to buy back rubles.
( ( To ( check this ) ) ( , ( ( the ( central bank ) ) ( ( has ( ( ( tripled ( interest rates ) ) and ) ( ( ( used ( hard ( currency reserves ) ) ) ( -LRB- ( ( now ( ( reduced ( to ( ( $ 10 ) billion ) ) ) ( in ( ready cash ) ) ) ) -RRB- ) ) ) ( to ( ( buy back ) rubles ) ) ) ) ) . ) ) ) )
(ROOT (S (S (VP (TO To) (VP (VB check) (NP (DT this))))) (, ,) (NP (DT the) (JJ central) (NN bank)) (VP (VBZ has) (VP (VP (VBN tripled) (NP (NN interest) (NNS rates))) (CC and) (VP (VBN used) (NP (JJ hard) (NN currency) (NNS reserves)) (PRN (-LRB- -LRB-) (VP (ADVP (RB now)) (VBN reduced) (PP (TO to) (NP (QP ($ $) (CD 10) (CD billion)))) (PP (IN in) (NP (JJ ready) (NN cash)))) (-RRB- -RRB-)) (S (VP (TO to) (VP (VB buy) (PRT (RP back)) (NP (NNS rubles)))))))) (. .)))
The bank doubled interest rates as a way of checking this.
( ( The bank ) ( ( ( doubled ( interest rates ) ) ( as ( ( a way ) ( of ( checking this ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN bank)) (VP (VBD doubled) (NP (NN interest) (NNS rates)) (PP (IN as) (NP (NP (DT a) (NN way)) (PP (IN of) (S (VP (VBG checking) (NP (DT this)))))))) (. .)))