yes, 9%, but Estonia is dependent on Russian gas. Plus all the roads and rails from estonia head to Moscow. Now they are planning (or have started building a train line from Estonia to Poland.
Heating gas can be replaced by heating oil. The stations were fitted for this in 1994 when Russia turned off the gas last time.
Russia decided to blockade all Estonian goods in the 90s hoping to make it submit, but only achieved that Estonia’s economy can’t be killed by Russian whims any more.