Washington DC, Sept. 6 -- US President Donald Trump on Friday (local time) admitted to not being able to fulfil one of his campaign promises, which helped him to win a second term in the White House, acknowledging his failure to stop the ongoing conflict between Russia and Ukraine, describing it as "probably the most difficult" conflict he faced during his administration.

Speaking at the first dinner with the US Congress held at the newly renovated Rose Garden at the White House, Trump again claimed credit for helping end several long-standing global conflicts but noted that, despite his relationship with Russian President Vladimir Putin, stopping the conflict in Ukraine was the "most difficult".

"Nobody has done what we did in seven mo...