Yet the Soviet leader 's readiness to embark on foreign visits and steady accumulation of personal power , particularly since the last Politburo reshuffle on Sept. 30 , do not suggest that Mr. Gorbachev is on the verge of being toppled ; nor does he look likely to reverse the powers of perestroika .	<arg1> Mr. Gorbachev </arg1> <rel> does not look likely to reverse </rel> <arg2> the powers of perestroika </arg2>	1