REUTERS Natural gas reserves in Ukrainian underground storage facilities (USFs) have increased by 55.4%, or by 4.12 billion cubic meters (bcm) since the gas injection season started on April 9, to 11.554 bcm. Some 366.55 million cubic meters (mcm) of gas was injected into the USFs on July 1-7, 2018, according to the state-run gas transport system operator Ukrtransgaz. Natural gas reserves in Ukraine&#39;s USFs as of July 7, 2018, were estimated at 11.554 bcm, which was 2.73%, or 323.89 million cubic meters, down from 11.88 bcm reported as of July 7, 2017. Read alsoNaftogaz submits to Stockholm Arbitration another major claim to Gazprom Ukrainian gas imports totaled 250.8 mcm on July 1-7, 2018, including 133.276 mcm via Slovakia, 101.07 mcm via Hungary, and 17.452 mcm via Poland. Domestic gas output stood at 397.92 bcm, while gas transit shipments totaled 1.63 bcm, it said. The country&#39;s USFs are filled by 37.33% as of Monday, July 9. As UNIAN reported earlier, Ukraine started 2018 with 14.7 bcm gas in its USFs, which was the largest gas stock as of the beginning of the year in the past five years.