How should I understand 延伸开来 within ……并且延伸开来，导致重大而长远的对抗? The following opinion piece considers a hypothetical scenario in which the USA and China's coronavirus death numbers were reversed:

总之，假如中国今天在一场全球共同灾难中成为应对最差、损失最大的那一个，美国和西方对中国的意识形态攻击一定会是海啸级的，并且延伸开来，导致重大而长远的对抗。
假如死亡30万人的是中国 会发生什么，2020年12月15日。


My translation: To sum up, supposing China today in the global common disaster became the one with the worst response and greatest losses, the USA and the west's ideological attack would be tsunami-grade, and extend [延伸开来 (??)], leading to great and long-reaching confrontation.

Question: How should I understand 延伸开来 in the above?
延伸 means &quot;extend/spread&quot; but 开来 is perhaps some kind of complement I'm unfamiliar with.
My try:  
These ideological attacks will spread (out into other areas, e.g. trading, copy-right, human right, ..., etc), leading to  greater and long-term confrontations.
 "長遠" here mean long duration in time, not spatial.