"We assume that contact will take place, as the two presidents will at the same time be in one town, in one building, in one room," Lavrov said.
He said it was traditional at such events that leaders crossed paths. If the two men meet, it will be their first face-to-face encounter.
"Probably it won't be right if they could not have a talk ... on many issues," Lavrov said.
Lavrov said it was especially important that Trump and Putin had an opportunity to talk about the conflict in Syria and efforts to find a peaceful solution.
He added it was necessary to seek "normalization" of dialogue between Moscow and Washington.
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