PoliticsEastern Europe on the front line of Russian gas supply risk, but market conditions ease concernsUS and Qatar ready to ratchet up LNG deliveries to the continentConflict: Ukrainian tanks move into the city of Mariupol, after Russian President Vladimir Putin authorised a military operation in eastern UkrainePhoto: REUTERS / CARLOS BARRIA / SCANPIXAmanda BattersbyOle Ketil HelgesenNishant UgalSingapore/Stavanger/New Delhi