If you include food, yes. Multiple nations have shot at unauthorized Chinese fishing vessels trawling within their borders, however China hasn't defended those ships beyond political posturing.
As far as fossil fuels go, I'm not aware of states defending their internationally recognized claims against other states... but there is growing tension behind unrecognized claims.
The South China Sea issue is largely driven by China using their navy to project borders beyond internationally recognized limits. Their official justification is reclaiming historical territory, which suspiciously became a priority when oil was discovered in the area.
Russia may be in a similar position. They've been building up their Arctic military force, presumably with the intent of claiming Arctic oil fields as the Northwestern Passages opens up due to climate change. However, again, they haven't claimed anything officially.
As far as fossil fuels go, I'm not aware of states defending their internationally recognized claims against other states... but there is growing tension behind unrecognized claims.
The South China Sea issue is largely driven by China using their navy to project borders beyond internationally recognized limits. Their official justification is reclaiming historical territory, which suspiciously became a priority when oil was discovered in the area.
Russia may be in a similar position. They've been building up their Arctic military force, presumably with the intent of claiming Arctic oil fields as the Northwestern Passages opens up due to climate change. However, again, they haven't claimed anything officially.