Russia’s stocks jumped on Thursday, the first day of trading in almost a month in the wake of its troops entering Ukraine, with gains in commodity stocks offset by a drop in a flagship bank and airline, in volatile trading backed by the promise of support from sovereign wealth fund money. The government said on March 1 it would channel up to 1 trillion roubles ($10.5 billion) from its rainy-day National Wealth Fund (NWF) to buying Russian stocks roiled by a massive sell-off last month. It was not clear if that money was being used yet, however, and the finance ministry did not immediately respond to a request for comment. The markets are gradually reopening after President Vladimir Putin sent his forces into neighboring Ukraine four weeks ago, leading to sweeping sanctions being imposed by Western capitals and countermeasures taken by Moscow. Those measures have seen Russia’s financial markets severed …