You seem to be under the impression that Trump was in office when the Russians took Crimea.
Russian Federation (de facto since 2014)
After the 2014 Ukrainian revolution and the flight of Ukrainian President
Viktor Yanukovych from
Kyiv on 21 February 2014, Russian President
Vladimir Putin stated to colleagues that "we must start working on returning Crimea to Russia."
[60] Within days, unmarked forces with local militias took over the
Autonomous Republic of Crimea and
Sevastopol, as well as occupying several localities in
Kherson Oblast on the
Arabat Spit, which is geographically a part of Crimea. A 2014 referendum on merging Crimea with Russia was supported by 96.7% of voters with a 83.1% turnout according to official counts, although it was boycotted by many loyal to Ukraine and denounced as illegitimate by Western governments.
[12][13] The
United Nations General Assembly approved a
resolution declaring the vote illegal and invalid.
[61][62][63] Putin signed a treaty of accession with the self-declared
Republic of Crimea, annexing it into the Russian Federation as two federal subjects: the
Republic of Crimea and the federal city of Sevastopol. Though Russia had control over the peninsula, sovereignty was disputed as Ukraine and the majority of the international community consider the annexation illegal,
[64] as was shown by the United Nations General Assembly adopting
a non-binding resolution calling upon states not to recognise changes to the integrity of Ukraine.
[65][61] A range of
international sanctions were imposed against Russia and a number of named individuals as a result of the events of 2014.[
citation needed]
en.wikipedia.org
Who was the president in 2014?