I'm only speculating here but could be a double bluff intended to allow Russia to say "hey look, that couple isn't even known to us, we told you the first poisoning wasn't us"
Seems you are bit cut off from reality.
Russia and Putin in person, has nothing to gain. Unfortunately is been proven time again that can outmanoeuvre anything thrown at him, while Lavrov is possibly his biggest asset.
World Cup is been a success. World media rave about the organisation and hospitality by everyone including the common Russians.
While the English fans there have taken the media saying that Russia is nothing of what the UK media describing, and a great place to go even for normal holidays.
That hurts the political system here. Also is even more damaging the power in the global stage UK will lose, if USA & Russia have the summit and come to an agreement.
The only country who will lose big time of such deal is the UK. Which will find itself out of EU, and cut off from the rest of the world crying wolf one too many times.
Already Germany is unwilling to negotiate with USA to stop developing the NS2, regardless the sanctions USA is threatening Germany for.
The war in Syria goes pear shape, and there ain't going to be a pipeline transporting gas & oil from "arab allies" through the country.
Completely making moot any plans to put hands on the Iranian oil & gas by instigating another war.
In addition there are calls already by other countries like Italy, that the EU should scale back sanctions and start making business with Russia.
Stating the current USA trade war as an example of we need allies to do business not enemies.
So Russia has nothing to gain my friend and a lot to lose by doing such cheap actions.
If they want to remove someone, they can just assassinate them and none the wiser.