Bondholders owed nearly $3 billion by a Dublin unit of the Russian leasing group GTLK are lawyering up after the borrower began to default in recent weeks, with an Irish-connected investment firm among the most active creditors. As previously reported, State Transport Leasing Company (STLC, or GTLK in Russian) is the largest lessor of transport assets in Russia and one of the largest in the world. It is owned by the Russian state and runs a large part of its international operations through an Irish subsidiary, GTLK Europe DAC. According to its latest accounts, filed in Ireland to the end…