Two points immediately:
1. I see no reason for Rex Tillerson to go to Moscow, there is nothing to talk about there--US is not a treaty-worthy party, in fact US is run by (neocon) mafia and less and less resembles a normal state;
2. Litmus test for Putin, we'll see what he is made of. Recall what I stated when Murahovsky described the situation in September of 2016.
It is too early to make any conclusions but Trump is done as a populist US President, he is now officially at Israel's service.