Trump's Middle East business deals could be template for ending Ukraine conflict / Putin thanks foreign friends for Ukrainian reconciliation efforts / US, Europe to work jointly to resolve Ukrainian conflict and establish peace -- Trump / US shows interest in sustainable settlement of Ukraine conflict -- Russia's UN envoy / Conflict in Ukraine cannot be resolved without US effort -- German chancellor / US sees progress in resolving Ukraine conflict -- State Department / US keeps on trying to settle conflict in Ukraine -- Rubio / EU wants to protract Ukraine conflict, prevent normalization of Russia-US ties -- official / US sees possibility of mediation for Ukraine conflict -- special envoy / Europe actively resists efforts to resolve Ukraine conflict -- Russian deputy defense chief