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It is “simply not true” that the UK is being dragged into another Iraq-style conflict in the Middle East, Yvette Cooper has said, after an RAF base in Cyprus was struck by an Iranian drone.

The attack was part of a barrage of strikes by Tehran around the Middle East following a US-Israeli attack on Saturday that killed the country’s supreme leader, Ayatollah Ali Khamenei. The UK foreign secretary confirmed ministers were considering possible plans to evacuate about 300,000 Britons from the region.

Britain had no involvement in the initial attack but in a statement late on Sunday, Keir Starmer said he had agreed to let the US use British military bases to attack Iranian missile sites, so as to limit the impact of Iranian strikes.

The decision prompted alarm among some opposition parties, with the Liberal Democrats demanding it be put to a vote in parliament. Asked if the UK risked being pulled into an escalating conflict with no end goal, simply because Donald Trump had asked, Cooper said: “That’s simply not true.”

She told Sky News on Monday: “We took a very specific decision not to provide support for strikes that were taking place over this weekend. We have been clear that we believe there should be a diplomatic process, negotiations process.”

With Iranian missiles and drones causing damage and casualties around the Gulf, as well as in Israel and Cyprus, the UK had to “recognise responsibilities we have around defensive support”, Cooper said, adding: “This is about the defence of our partners in the Gulf and defence of countries where we have so many British citizens and interests in those those countries.

“It’s a specific, limited agreement about the defence of Gulf countries, and many of those Gulf countries were not involved in any of the strikes on Iran. So, for example, it doesn’t mean political and economic and infrastructure targets, but there is a significant issue about ballistic missiles and launchers that were effectively pointed at the Gulf, pointed at our partner countries, and countries where we have so many British citizens.”

Asked about the safety of hundreds of thousands of UK nationals in the region, Cooper said the hope was to avoid the need for a mass evacuation, but that this remained an option.

“We’re working on every possible option,” she said, saying about 300,000 UK nationals were affected. “What we want, obviously, is for a resolution and for airspace to be reopened so people can get normal flights back again. But of course, we are looking at a wide range of options, working with the travel industry and with government evacuation if necessary.”

Asked about the strike at the RAF Akrotiri base in Cyprus, Cooper said it was an “unmanned drone strike specifically on the airport runway”, but said she was unable to give further further information. The Ministry of Defence confirmed that people who live at RAF Akrotiri were being moved to accommodation nearby on Cyprus “as a precautionary measure”.

In his statement on Sunday, Starmer said: “The only way to stop the threat is to destroy the missiles at source in their storage depots or the launchers which are used to fire the missiles. The US has requested permission to use British bases for that specific and limited defensive purpose.

“We have taken the decision to accept this request – to prevent Iran firing missiles across the region … killing innocent civilians … putting British lives at risk … and hitting countries that have not been involved.”

The government also released a summary of its legal position, saying: “The UK is acting in the collective self-defence of regional allies who have requested support.”