A senior US official said on Thursday he was unhappy with a British decision to open low-level contact with Hezbollah and suggested London only indirectly informed the new US administration ahead of time.
Nasrallah also saluted recent moves to smooth over Arab differences, with Saudi Arabia and Egypt seeking to improve ties with Syria, which has supported Hezbollah.
"All Arab reconciliation reinforces us," he said.
He called for Riyadh and Cairo to "extend a hand" to Iran, Hezbollah's main backer.
A Hezbollah-led alliance has veto power over major decisions in the current unity government formed in July following a political crisis that brought Lebanon to the brink of civil war.
Legislative elections are set for June 7 in Lebanon