The phrase "assertive role in the" is correct and usable in written English.
It can be used when discussing someone's active and confident participation or influence in a particular context or situation.
Example: "In the project, she took an assertive role in the decision-making process, ensuring that her ideas were heard."
Alternatives: "active role in the" or "proactive role in the".
In neighboring Saudi Arabia, it's "Saudi first," as a brash young crown prince steers the kingdom toward a more assertive role in the region.
There's no point updating the story, of course, and in fact the girls do in any case take a reasonably bold and assertive role in the adventure.
In fact, Italian aircraft played a more assertive role in the bombing raids than the public were told at the time.
Relatively poor, with a population that pales before countries like Egypt, Syria has long played an assertive role in the region by making itself a linchpin.
In fact, if the euro is to survive, German policymakers have to play a much more assertive role in the governance of the euro zone.
But it needs American support to play a more assertive role in the coalition against Mr. Assad by bolstering the Syrian opposition, both politically and militarily.
The United States also intends to play a more assertive role in these talks.
If such expressions would quicken the search for a formula of reconciliation, and would press our own Government to take a more assertive role in that search, then they would be, as Professor Cohen has found, in sympathy with American Jewish sympathies.
At a time when the U.S. and other traditional economic powers are weakening, China is flexing its muscles, signaling it will seek a much more assertive role in shaping the future of the world financial order.
Mr. Blair has been pushing the United States to take a more assertive role in bringing the two sides together and to counter the widespread impression in Europe that the White House is too sympathetic to Israel.
Both urged their Muslim audience to help the next American president, whoever that may be, to help prevent Pakistan from becoming a failed state and preventing its nuclear weapons from falling into the wrong hands and to take a more assertive role in solving the Arab-israeli conflict.
