The top U.S. envoy to Taiwan on Wednesday said American support for the island is "rock-solid, principled, and bipartisan," and said Washington will continue to follow through on its commitments to ensure the island can defend itself against threats from China.

Raymond F. Greene's remarks Wednesday come at a time of uncertainty over China's intentions toward the island it claims as its own territory — to be taken by force if necessary — and amid conflicts in Ukraine and the Middle East that threaten to draw the U.S. in further.