The Pacific port city of Vladivostok would be a likely possibility for the meeting given its relative proximity to North Korea, the official said.
The Wimbledon champion will face Madison Keys for a place in the last four.
The Russian president was speaking after meeting Turkey’s leader.
Here, the PA news agency looks back at day seven at the US Open.
A one-sided final set saw former French Open champion Ostapenko triumph 3-6 6-3 6-1.
Draper reached fourth round for the first time as Cameron Norrie, Dan Evans and Katie Boulter’s runs were ended.
The PA news agency looks back at day five at the US Open.
The pair had been out for a meal in New York last week and Swiatek spoke of their enduring friendship on the WTA Tour before the match.
Katie Boulter joins trio of men in third round after another good day for British tennis.
There was another home success when Taylor Townsend beat Brazilian 19th seed Beatriz Haddad Maia.
The launch came hours after the United States flew at least one long-range B1-B bomber to the Korean Peninsula.
Lily Miyazaki made a mark on her Flushing Meadows debut to reach round two as Novak Djokovic returned to world number one and Iga Swiatek also won.
Young American hope dropped the first set before beating Laura Siegemund in niggly encounter.
The Spaniard beat Djokovic in the Wimbledon final last month.
Carlos Alcaraz and Iga Swiatek, the current world number ones, will bid to defend the titles they won last year.
