KIEV, June 30 - Ukraine boosted natural gas reserves in its underground gas storage facilities by 1.1% over the past week even after Russia’s gas supply cutoff, data released by Gas Storage Europe indicate.

Ukraine accumulated 14.24 billion cu m of natural gas as of June 27, compared with 14.091 Bcm as of June 20, according to GSE, a non-profit Brussels-based organization that provides energy statistics to the EU.