Looking at technical alone here, suggest that Gazprom has plenty of room to go up with the daily and the weekly RSI severely oversold.
On top of that we can see quite clear positive bullish divergence and looks to be set up to break out of the descending bullish flag.
Watch out for the resistance around the 370 mark - a break and a retest is ideal and you could potential buy at the retest, but buying from the descending bullish flag is ideal for profit maximisation.