[wvoch235]

> If German chancellor or US president visited Russia, and there were enough desire to arrest them, they would be arrested. I don't see practical means to prevent it.

Invasion. It would lead to invasion.

[CiaranMcNulty]

It'd be pretty tricky for Russia to invade Germany, based on how things are going in Ukraine

[avmich]

Invasion is something which may - or may not - happen afterwards. At the moment there won't be enough physical counterforce to prevent the arrest.

[MilnerRoute]

Attempting to invade a member of NATO provokes an armed response from all of NATO. America, France, Italy, Germany, the UK, Spain... 30 countries in all.

https://en.wikipedia.org/wiki/Member_states_of_NATO

I think this is ultimately the wrong way to prove that the headline is incorrect. Putin will almost certainly just never go to Germany to avoid testing how hard it would be to avoid arrest.