Brussels has been accused of driving building businesses across Europe to the brink of insolvency after imposing antidumping duties on imports of Russian birch plywood.   The anti-dumping duty - which adds a charge of as much as 15 percent to Russian birch plywood - risks piling more pressure on companies already reeling from chronic supply shortages and battling a surge in inflation, according to a letter signed by more than 100 companies.  Officials imposed the anti-dumping tariff following an investigation into a surge in cheap Russian birch plywood exports, amid fears producers from the ...