The Bank of Russia revoked the license of a top-100 lender for the second time in three weeks, intensifying the industry's cleanup started under Governor Elvira Nabiullina. Probusinessbank, the country's 51st-largest by assets, lost its license for violating laws on banking activity, the regulator said in a statement on its website Wednesday. The lender's capital adequacy ratio fell below the minimum requirement of 2 percent of risk-weighted assets, according to the central bank. Nabiullina is escalating her battle with banks deemed mismanaged or under-capitalized as part of her campaign to clamp down on dubious capital transactions and improve lending practices. The regulator pulled the licenses of 13 banks last month, including the country's 45th-largest lender, the highest total since Nabiullina took office in 2013.