LONDON (Reuters) -Britain put in place new legal powers on Wednesday to prohibit maintenance on aircraft and ships belonging to specific sanctioned Russian oligarchs or their businesses. The government is acting in concert with Western allies to try to cripple the Russian economy as punishment for Moscow’s invasion of Ukraine. It has targeted Russia’s access to the international financial system, industries like shipping and defence, and wealthy elites close to President Vladimir Putin. Britain said the new legislation effective from 1600 GMT prohibits maintenance on aircraft or ships belongin…