"high level exchange" is a correct and usable phrase in written English.
You can use it to refer to the exchange of ideas or information between people or countries on a high level. For example, "The White House is hosting a high level exchange between the President and the Prime Minister of Japan this week."
With more speakers in a conversation, it is more likely that different ideas will be expressed, more questions asked, and potentially higher level exchanges of reasoning.
They agreed that Britain and Syria would establish a high-level exchange of intelligence.
"British institutions have always seen India as a huge art resource, but now it's being seen as a place for serious high-level exchange," said Adam Pushkin, the head of arts at the British Council in India.
He had hoped to travel to Beijing in August as part of a high-level exchange, but was denied a visa.
The confrontation with Beijing puts a chill on Mr. Bush's first high-level exchanges with the Chinese leadership.
China stepped up its maritime dispute with Japan today as it halted high-level exchanges over the extended detention of a Chinese fishing boat captain.
It is understood that yesterday's meeting between the foreign ministers had been preceded by urgent high-level exchanges over the past few days.
The suspension of high-level exchanges risks derailing ongoing talks over drilling rights to potentially vast oil and gas deposits in disputed areas.
Japan claimed today that it had not been officially told of China's decision to break off high-level exchanges amid a deepening row over the detention of a Chinese fishing boat captain.
Analysts say Beijing rebuffed earlier proposals of high-level exchanges because it wanted to demonstrate its displeasure and was not guaranteed a meeting with Kim if it sent an envoy to Pyongyang.
