WASHINGTON — Army Secretary Dan Driscoll is the latest unconventional US emissary attempting to strong-arm Ukraine and Russia into sealing a peace deal as President Trump tries to end almost four years of war.

Driscoll, the 39-year-old “best friend” of Vice President JD Vance , wrapped up two days of meetings with a Russian delegation in Abu Dhabi Tuesday after securing Ukraine’s tentative agreement to a revised peace framework following weekend talks in Switzerland.

The Army secretary’s meteoric rise has its roots in the White House tapping Driscoll’s office to boost the Pentagon’s counter-drone capabilities, which languish behind both Russia and Ukraine.

Driscoll — to whom Trump has referred as “the drone guy” — initially went to Ukraine to suss out ways the US can capitalize on

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