Foreigners read the slogans of various countries.

The second one is not from China, and the first one is from China.

However, it should be to rather than of.

Warmly welcome the presence and guidance of XXX company.

Welcome to XXX company for guidance.

For example, welcome to China, where "to" is a preposition followed by a noun.

Even if other words are added in front, the reason is the same.

The case is the same as the composition topic, just like what you wrote. I'm sure of that. We are going to hold the Asian Winter Games in Changchun recently, and banners everywhere are written like this, hehe.