After former US House of Representatives Speaker (2nd in line to US president after the Vice President) Nancy Pelosi travelled to Taiwan and met with Taiwan President Tsai Ing-wen (see August 2, 2022 visit by Nancy Pelosi to Taiwan) China's military executed extensive unprecedented activity around Taiwan in a demonstration of threatening force.
While US congress members from both houses have visited Taiwan many times and met with Tsai, this was likely perceived very differently by China due to Pelosi's perceived level of importance as 2nd in the line of succession to the US presidency.
CNN's April 2, 2023 Beijing warns of ‘severe impact’ on US-China relations as Taiwan’s leader lands in New York says:
Tsai’s US transit could lead to a “serious” confrontation in the US-China relationship and have a “severe impact” on their ties, China’s charge d’affaires Xu Xueyuan told reporters in Washington on Wednesday.
“What the US has done seriously undermines China’s sovereignty and territorial integrity,” Xu said, adding that the US should bear “all consequences.”
Tsai’s travels have been under particular scrutiny following reports that she will meet US House Speaker Kevin McCarthy during one of her unofficial stopovers in the US – a potential event Beijing has vowed to “resolutely fight back” against should it go ahead.
Taiwan has not confirmed such a meeting nor provided details of Tsai’s itinerary while in the US.
Beijing launched extensive, days-long military exercises around the island last August, following a visit from then-US House Speaker Nancy Pelosi to Taipei.
Pelosi was the highest ranked American official to visit Taiwan in 25 years, and the trip sparked accusations from Beijing that the US was changing the nature of its relationship with Taiwan – a claim US officials have repeatedly refuted.
In the 21st century, two individuals can talk electronically any time they want, and these conversations can generally be made as public, or as secure as they like, especially when implemented with state-level technology.
So I assume it's not the exchange of words that bothers China, but the visibility, the "optics" they wish to address with "vow(s) to 'resolutely fight back'" against a meeting.
I'm curious if threats related to the possibility of meetings is primarily a Chinese thing, or if there are similar phenomena by other countries. So I'd like to ask:
Question: Besides China (as exemplified by it's statements about Taiwan's president meeting US Speakers, e.g. "Tsai better not meet with the US House Speaker or else we'll do things to retaliate" (loosely paraphrased)), are there other examples of such threats by other countries in retaliation to meeting and talking in a publicly visible way in other contexts?