After war began last month, President Volodymyr Zelensky of Ukraine turned to Mykhailo Fedorov, a vice prime minister, for a key role.
Mr. Fedorov, 31, the youngest member of Mr. Zelensky’s cabinet, immediately took charge of a parallel prong of Ukraine’s defense against Russia. He began a campaign to rally support from multinational businesses to sunder Russia from the world economy and to cut off the country from the global internet, taking aim at everything from access to new iPhones and PlayStations to Western Union money transfers and PayPal.
To achieve Russia’s isolation, Mr. Fedorov, a former tech entrepreneur, used a mix of social media, cryptocurrencies and other digital tools. On Twitter and other social media, he pressured Apple, Google, Netflix, Intel, PayPal and others to stop doing business in Russia. He helped form a group of volunteer hackers to wreak havoc on Russian websites and online services. His ministry also set up a cryptocurrency fund that has raised more than $60 million for the Ukrainian military.
The work has made Mr. Fedorov one of Mr. Zelensky’s most visible lieutenants, deploying technology and finance as modern weapons of war. In effect, Mr. Fedorov is creating a new playbook for military conflicts that shows how an outgunned country can use the internet, crypto, digital activism and frequent posts on Twitter to help undercut a foreign aggressor.
McDonald’s have withdrawn from Russia, with the war’s human toll provoking horror and outrage. Economic sanctions by the United States, European Union and others have played a central role in isolating Russia.
Mr. Zelensky was elected in 2019, he appointed Mr. Fedorov, then 28, to be minister of digital transformation, putting him in charge of digitizing Ukrainian social services. Through a government app, people could pay speeding tickets or manage their taxes. Last year, Mr. Fedorov visited Silicon Valley to meet with leaders including Tim Cook, the chief executive of Apple.