Hungary's top diplomat urges EU to avoid interfering with Russia-Ukraine talks in Istanbul / Hungary, Slovakia to oppose Brussels' plan for refusing from Russian gas -- top diplomat / Ukraine to start consultations with Hungary to unblock EU accession talks - Stefanishyna / Hungary, Slovakia to keep exceptions from EU sanctions for Russian oil -- Orban / Slovakia, Hungary call for immediate cessation of conflict in Ukraine -- Slovak PM / Hungary's foreign minister certain about Russia's commitment to reaching peace in Ukraine / Ukraine's EU membership would mean continued war in Europe -- top Hungarian diplomat / Forces opposing Ukraine peace resolution unite in Europe -- top Hungarian diplomat / Hungary's top diplomat says he, Estonian counterpart worlds apart on Ukraine / Hungary's foreign minister warns Ukrainian NATO membership could escalate conflict