Turkey wants Russian cultural center in Istanbul, says head of Yunus Emre Institute / US, Russia delegations hold talks in Istanbul on diplomatic missions / Participants in Russia-US talks in Turkey break for lunch / Turkish political analysts hope Russian-US meeting to facilitate Ukrainian settlement / Russia-US Istanbul talks to focus solely on operation of diplomatic missions -- US official / Russia-US consultations in Istanbul take place in business-like atmosphere -- MFA / Turkish and Russian envoys discuss latest developments in Syria / Trump may pressure Ukraine to end war with Russia, Turkish expert suggests / Russian foreign minister to meet with his Turkish counterpart in Istanbul / Erdogan, Putin discuss Turkiye-Russia ties