The subamendment says that the committee—not the subcommittee but the committee—makes decisions on the studies before it on Ukraine, so it removes the requirement for the completion of the study on Ukraine and replaces it with a requirement for the committee to make a decision about the study on Ukraine.
It seems to me that the substance of the situation in Ukraine would likely inform whether or not members thought it was vital to complete or make a decision about that.
I completely accept what you're saying—