Trump used his four-year hiatus from the White House wisely. From Patrick Lawrence at unz.com:

NATO meeting of defense ministers in Brussels on Feb. 13. (NATO, Flickr, CC BY-NC-ND 2.0)
Eight years ago, at precisely this moment in Donald’s Trump’s first term, the new president was pushing his case for a restored détente with Russia. Trump went on to summit with Vladimir Putin five times and conducted at least 16 telephone exchanges with the Russian president.
This was the count by mid–2019. After that and until the end of his term, the Deep State — notably the intelligence apparatus, the Democratic National Committee, and the mass media — had Trump bound in the rope of subterfuge so thoroughly that the relationship developed no further.
The neo-détente Trump favored — that Trump was correct to favor, better put — never came to be. Joe Biden and his people, to state the obvious, were by contrast neo–Cold Warriors — mere ideologues, neoliberals wholly incapable of autonomous thought, initiative, imagination, or anything else that sophisticated statecraft requires of its practitioners.
Trump began his second term not quite a month ago, having promised throughout his political campaign to end Biden’s proxy war in Ukraine within a day of assuming office. And it is already evident that his ambitions now run far beyond the settlement in Ukraine he has long promised and the modest détente with Moscow he sought during his first four years in the White House.
The Biden project, from his years as Barack Obama’s vice-president and certainly during his term as Obama’s successor, was to isolate the Russian Federation as completely as possible by way of a poorly conceived sanctions regime, covert operations such as the Nord Stream pipeline explosions, a towering wall of propaganda and what coercions were necessary to secure the allegiance of European clients who were, in any case, already wanderers on the world stage with no clue as to their purpose or even their interests.