Lauren Yee's Mother Russia, now at Signature Theatre under the direction of Teddy Bergman, barrels forward with the jittery energy of a system in freefall. Set in 1992 St. Petersburg, just after the collapse of communism, the play drops us into a world where identities, loyalties, and entire economic structures are being rewritten in real […] The post Lauren Yee's Mother Russia at Signature Theatre Is a Chaotic, Cl…